4000: Quadrivium by Dimitry, Viking, Arcturus & Trev

This was a superb puzzle and Viking's grid forming four Ms was awesomely filled by Dimitry. Each of the four setters had a theme connected with M. There were enough easy clues to get the ball rolling but it was complicated by the unique way in which 2 setters did the across clues and the other two the downs.

Belligerent by Dimitry
With a return to Dimitry's Plain Hunting, it was possible to find the quotation, "RING OUT THE THOUSAND WARS OF OLD". This made clear that the unclued entries were the names of battles, each beginning with M, but with the Ms omitted. Thes were 4 MONTREAL, 9 MALPLAQUET, 27 MAGENTA, 28 MARENGO, 29 MONTE CASSINO, 38 MARATHON, 53 MOERSKIRCH and 62 MARSTON MOOR.
TOP HALF (ACROSS)
15 Expire at the western end of great endless desert (4)
GOBI GO + BI(G)
17 Water warming device in Baden-Baden always is turned on (9)
IMMERSION IMMER (German for ALWAYS) + IS (rev.) + ON
18 Thawing snow is so nearly all over island (5)
MOIST I in MOST
19 I'm avoiding animals when feeding - there's a large number on plain (5)
VEGAN VEGA (plain) + N
21 Holey material girl used to hide lower leg (7)
MESHING SHIN in MEG
22 Camp with difficulty amid meadow-grass genus with cinquefoil (10)
POTENTILLA POA containing TENT + ILL
23 Company provide for Scots item for their dining table (5)
COGIE CO (company) + GIE
26 I answer after having knocked back full-bodied spirit (5)
TAFIA FAT (reversed) + I + A (answer)
30 Ancient private land continually covered in Shorea robusta (7)
SEVERAL EVER in SAL
32 Bits off a reef cape river's swept over near the mouth (9, two words)
SEED CORAL C (cape) + DEE’S (reversed + ORAL
33 With a thin appearance cut of beef's not fine (4)
LANK (F)LANK
35 Start of academic row as new element initially links phosphorus and yttrium (6)
PUTNEY P (phosphorus) UT (as) N(ew) E(lement) Y (yttrium) (ref. start of Oxford/Cambridge boat race!)
36 A pair of people live around the French town (7)
PEEBLES PE(ople) + BE (reversed) + LES
40 I and others kept in by teacher for being a bit slow up north (5)
SWEIR WE in SIR
41 Half lined up with the axis deer's hiding place (4)
VERT VERT(ICAL)
43 Soda and lime might be poured into these good girls (7)
GLASSES G (good) + LASSES
46 Constant and extreme dislike of upper-class French noble's house (7)
CHATEAU C (constant) + HATE + À + U
47 Bid to seize cocaine hauled on board (6)
TRICED C in TRIED
48 Trap caught chum turning tail with a number having to be thrown back (7)
CLAPNET C (caught.) PAL (reversed) TEN (reversed)
52 What was previously mentioned advisedly shows it (3)
SED Hidden
59 Fixed a structure that's a bit hairy (4)
SETA SET + A
60 Device to stabilise plasma temperature has wooden surrounding distorted in the past (7)
TOKAMAK T KAM in OAK
64 At first like oribis, pukus employ a springing run (4)
LOPE first letters Like Oribis, Pukus Employ
66 Rye fungus, perhaps Ustilago, most severely reduced on further attempt (5)
UREDO U(stilago) + REDO
67 Thus organisation of spies enrols left-wingers (10)
SOCIALISTS SO (thus) + CIA + LISTS
68 Girl's locked in during holidays for spiritual purity (8)
HOLINESS INES in HOLS
69 Branched structure went to ground correctly, it's reported (8)
DENDRITE Homophone DENNED RIGHT

Masterworks by Viking
 Viking challenged us with a code that was tricky to solve. The correct letters of definitions gave the phrase METAMORPHOSEN RICHARD STRAUSS. The thematic entries were all the names of musical pieces beginning with M. In their place the names of the composers had to be entered in code using the thematic phrase - SYMPHONY OF A THOUSAND G MAHLER. The title could be interpreted as M – Works. The names of the composers are given at the end of the explanations of clues.
BOTTOM HALF (ACROSS)
70 Look to plunder art (8, two words)
AIR RIFLE (arm) AIR (look) RIFLE (plunder)
73 Like a buck, perhaps, or stag - lure for slaughter (8)
GESTURAL (like a beck).Anagram.STAG.LURE
75 One crashing old car into matted reeds (10)
DESECRATER (one trashing) Anagram REEDS containing CRATE
76 Group centred on Lenin's Third International follow German Engels, possibly (5)
GENII (Angels, possibly)
77 German river firth (4)
GLEE (mirth) G Lee
78 Low luminance in the evening (9)
MOONLIGHT  MOO + L in NIGHT-BEETHOVEN
80 We like to make sure girl's present in school tests (7)
SADISTS (We like to make sore) DI'S in SATS
82 Defending king in quite the wrong way (4)
LAER (Defending ring) REAL (reversed)
85 Members of team add ale naughtily (9)
MADDALENA  Hidden - PROKOFIEV
86 Way to get money for a dower (3)
VIM (power) VIA swapping A forM
88 Power conductor making clatter (7)
PRATTLE P + RATTLE (ref. Simon Rattle)
89 Laud excellent working in Oxford's principal Institute (6)
ROARIE (loud) RARE (excellent) with O(xford) and I (Institute) worked in
91 People baptise with special rites observed at Wells (7)
MENDIPS (rises observed at Wells) MEN + DIPS
94 Cash for towing motorists agreed outside (7)
DRACONE (case for towing) RAC in DONE
97 Jade, could be right when set in ring (4)
EYRE (Jane, could be) R in EYE Ref. Jane Eyre
98 Bringing back a lot of hemp, I'm skint, repeatedly (5)
MIDIS (skirt, repeatedly) SID(A) + I'M (all reversed)
99 Upright pole's about average length (7, two words)
MA VLAST  AV + L in MAST - SMETANA
101 I can produce tasty dosh; Irish look in envy, perhaps (7)
SIRLOIN  (I can produce tasty dish) R (Irish) + LO in SIN
103 Skill not at first as fast (6, two words)
IN ESSE (as fact) (F)INESSE
105 Will you need nothing for starters? Ask and it could be put together (4)
WYNN  (Ash and it could be put together) Initial letters -Will You Need Nothing. Wynn and ash are both Runic letters
106 Irish lender - is every one following proper procedure? (9)
TAOISEACH TAO (the right way) + IS EACH
108 Defines distance - unit's around league (7)
DISTILS (refines) DIST + L in I'S
110 Archaic dance brought back in Maine (11, two words)
MARCHE SLAVE ARCH. + VALSE (reversed) in ME (Maine) - Tchaikovsky
112 Institute's stopping return of traditional type of crops? (6)
MIGNON I in NON-GM reversed - Thomas
113 Hare around this island getting lost (6)
MARTHA MARA containing TH(is) - Flotow
117 Repot root in earth base (5)
ETAPE (Depot) E (earth) TAP E (base)
118 Surveying map, so ramblers can discover more spots (5)
PSORA Hidden (Sore spots)
119 Wife's into cooking pies with shape as cubes (10)
HAWSEPIPES (tubes) W (wife) in Anagram PIES + SHAPE
120 Used coop or pound to keep martens out of my area with poles (7)
QUIRTED (Used crop) (ma)RTE(ns) less M(y) A(rea) and NS (poles) in QUID (pound)
121 Shift's facing target set by partners (5)
STEEN (Shaft’s facing) TEE in SN (bridge partners)
122 Strangeness detected after headless ghost glides (5)
AUNTS (guides) (H)AUNTS
123 Tent critically needing nice pitching in touring sites (9)
SCIENTISE (Test critically) Anagram NICE + SITES
124 Democrat dropping out of race could be basis for coup (4)
BREE (basis for Soup) BREED less D
125 Main line on the way back is blocked by a trunk (9)
METABOLES A BOLE in STEM (reversed) - Dutilleux
126 Informal address on letter linked to house (7)
MACBETH MAC + BETH.(the letter represented by a house) - STRAUSS

Submerse by Arcturus
Eight clue answers, all beginning with M, had to be treated as if the word was a cryptic clue. Gregson found this thematic element most worrying. Apparently the title is an anagram of M- REBUSES.
Thematic entries are shown in square brackets.
LEFT HALF (DOWN)
1 West Africans having racket in fruit (9)
MANDINGOS DIN in MANGOS [MINGOS M and INGOS]
2 Funny emoticon introducing news of sexless procreation (11)
MONOGENETIC GEN (news) in anagram EMOTICON [MOGENETIC M on OGENETIC]
3 Summers, perhaps in Channel Islands, with an outer garment on (5)
ABACI ABA + CI (Channel Islands)
4 Decline to consider appearing in Scottish list (9, three words)
RUN TO SEED TO SEE in RUND
5 Bargain without middle section is void (6)
NEGATE NEG(OTI)ATE
16 Drunk baronets run and tango away in these jollifications (6)
BEANOS
17 Build dome and end unseemly wavering (12)
20 Pass around cold emergency room organs (7)
24 Slick ground outside yard entrance (12)
25 Each lieutenant following king - that is sincerity to John (7)
31 Scouts cast around for a keeper (6)
37 Useful word for The Globe's bouncers (to defend the theatre floor endlessly)? (7)
40 Castle's ghost is a duke in pale Scottish clothing (9, two words)
41 Disturbed slumber involving a cry of pain and meaningless words (9)
RUMBELOWS Anagram SLUMBER.containing OW [RUSM – RU + M below S]
42 Other men tame larks as an alternative to a canary (12)
METHANOMETER Anagram OTHER MEN TAME [ETHA (NO M) ETER]
50 Turkish police force connection with Home Secretary (8)
ZAPTIEHS ZAP + TIE + HS
51 I observe pride (10)
SELF-REGARD 2 definitions
54 After time this artist reveals collection kept in bottom drawer (8)
ROUSSEAU (T)ROUSSEAU
61 Mexican dish and trifle eaten by dog (7)
TOSTADA TAD in TOSA
65 Monks start to cheer youth (9)
MINORSHIP MINORS + HIP [M in ORSHIP]
71 Slices are suitable for children in French station (6)
FRUSTA FR (French) U + STA (Station)
72 Hole got bats over year's study of animal behaviour (8)
ETHOLOGY Anagram HOLE GOT + Y (year)
73 Penguins are not swimming in these creeks (4)
GEOS GENTOOS less anag. NOT
79 TV can and might broadcast a fight (11, two words)
BOXING MATCH BOX (TV) + anagram CAN + MIGHT [AMTCH – ATCH boxing M]
84 Pub scuttles are found in more than one ingle (9)
BARDASHES BAR + DASHES (ingles = catamites!)
95 One flies for a very long time (3)
EON Anagram ONE
100 Nightclub was called to notice (7, two words)
HOT.SPOT 2.definitions
104 Drive around it without us - at a reasonable speed (6)
GIUSTO US in IT in.GO
105 I had parting request for broad (6)
WIDISH I’D in WISH
109 Handle tiles awkwardly (5)
STEIL Anagram TILES
112 Mind the sticky mass! (4)
GAUM 2 definitions
114 Did exploit feature in omnibus edition? (4)
USED Hidden
115 A thousand and one grams go north of the border (4)
GANG G (thousand) + AN + G (grams)
116 Arrogance can be shown should these social gatherings involve bridge (4)
HUIS HUBRIS less BR (bridge)
119 Man loses head in accident (3)
HAP (C)HAP

Get Ready! by Trev
The title referred to Money. The extra letters, in clue order, provided part of a quotation. (Si possis recte) SINON QUOCUMQUE MODO REM - HORACE, EPISTLES. The full quotation translates to "money by right means if you can, if not, by any means, money." Eight clues led to words which had to be jumbled to form a type of money.

Extra letters in wordplay and altered entries are shown in square brackets.
RIGHT HALF (DOWN)
6 Little girl represented Isles (4)
LISE Anagram I[S]LES
7 Throw out appeal by record company (4)
EMIT EMI (record comrany) and [I]T (sex appeal)
8 Manipulate harmonising with one missing (4)
TONG TONI[N]G less I
9 Period when group's on top (5)
TRIAS  TRI[O] + AS (when)
10 Bright girl born with spleen inverted (6)
EILEEN NEE (born) + LIE[N] (spleen)
11 Quietly, soldier takes tea round political organisation (7)
APPARAT P + PARA in [Q]AT
12 Mute orderly not in good health (6)
POORLY POO (here, mute = dung!) + R[U]LY
13 Approve a sign (4)
AMEN A [O]MEN
14 Fired officer abandoned by men (3)
LIT LI[C]TOR less OR (men)
18 It's colourful playing grunge with ease (9)
SAGEGREEN Anagram GR[U]NGE + EASE
33 Bird losing weight in equal quantities (3)
ANA [M]ANAKIN less KIN (the weight)
34 Speaks about once getting finally wrecked - in this boat? (8)
LOG-CANOE LO[Q] + A (about) + (gettin)G + anagram ONCE
39 Reed organ superior at first (5)
SPEAR S[U]P + EAR [ASPER]
44 Eggs placed round about birds (6)
LAROID RO[E] in LAID
45 Big fish entering one by one (one lost) in resentful fashion (10)
SNARLINGLY [M]ARLIN in SINGLY less I
49 Aquatic mammal, hiding in plant, gives birth (7)
LITTERS [O]TTER in LIS [TESTRIL]
55 Beamish promotion - I'd got round during noisy frolic (7)
RADIANT A[D] + I’D (reversed) in RANT
56 Fairly young body will beat his (8)
SMALLISH S[O]MA (body) + ’LL (will) + anagram HIS
57 Cut despicable person's head off (4)
ETCH (W)[R]ETCH
58 Dry in garden? Line that will help (8, two words)
HOSE REEL SERE in HOE + [E]L (line)
63 Wild 'orses gobbling up dishes? I'll handle them (9)
OSTLERESS [M]ELTS (reversed) in angram ORSES
67 Support temperature control, perhaps, in plant's generator (8)
SOREDIAL S[H]ORE + DIAL [SOLIDARE]
74 Incorporates further aggregate services (7
RESORBS [O]RE (aggregate) + SORBS (service trees)
81 The same one on the skin (4)
IDEM I + DE[R]M [DIME]
83 Has time to follow a young lady within (6)
AMIDST A M[A]ID + S (has) + T
86 Most truly so called sweets have green outside (7)
VERIEST I[C]ES in VERT
87 Sea-monster devouring capital character (7)
CLIMATE LIMA in C[E]TE [METICAL]
90 "A" grade to be amended or abolished (9)
ABROGATED Anagram A GRAD[E] TO BE
92 Shape one depicts otherwise (7)
DIE-CAST Anagram A (one) + DE[P]ICTS
93 Connection in opening heart treatment (9)
SPARTEINE T[I]E-IN in SPARE [PISTAREEN]
96 Dispute unites companies (7)
PARTIES [S]PAR + TIES [PIASTRE]
102 In bed and in France, politician, one hard to remove (6)
LIMPET LIT (bed) containing MP + E[T] (and in French)
106 This male's confused without a system of belief (6)
THEISM Anagram THIS MA[L]E less A
107 Not once having a pipe, but came close (6)
NEARED NE  + A R[E]ED [DEANER]
111 Actors go to bed without sign of hesitation (5)
DOERS ER in DO[S]S