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The music is Shostakovich's 7th symphony, the orchestral score; sadly not publicly available as it's under copyright but there are a few versions floating about online. At rehearsal mark 141 the tempo changes to 112 beats per minute, with the mysterious designation "M. M." beside it.

Sheet music

The score switches a few times to that exact tempo earlier in the same movement, but then it is indicated with the name Adagio instead. There's one other version of the score that simply doesn't name the tempo in that part but just says 𝅘𝅥 = 112. Other named tempi in that movement are Largo 𝅘𝅥 = 92 and Moderato risoluto 𝅘𝅥 = 120. This is also not the first time a tempo has been specified without a name; 𝅘𝅥 = 120 appears at mark 111. The score I have includes an introduction but it merely states suggestions for instrumentation (such as getting a second and third snare drum for the first movement), nothing about "M. M.".

This page suggests it means Metronome Marking in either English or German, but given that the score is written entirely in Italian and this is the only occurrence of the term, I am not sure if that is the case. If it is, I wonder what the significance is of attaching it to this tempo mark alone in the 260 page score.

There is no confusion about what tempo is specified, and given that M. M. doesn't appear in at least one other version of the same score is it probably not that important: however it is a mystery I would like to see resolved.

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  • As others have remarked, it doesn't seem to be a real mystery, just a quirk. People aren't always consistent. Things get left out. Apr 3 at 12:43
  • Which edition is this from? Apr 4 at 10:05
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    So your question isn't really what this means (it's a very common notation), but why this score is inconsistent about using it.
    – Barmar
    Apr 4 at 14:44
  • @Barmar I had hoped that, given that this score used it only once and in a specific place, that the meaning of the mark would elucidate why they chose to place it there.
    – KeizerHarm
    Apr 4 at 16:03
  • Is asking for the definition of a symbol a distinct question from asking why and where someone would use a symbol?
    – KeizerHarm
    Apr 4 at 16:09
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It stands for...

M.M. Metronome Marking. Formerly "Mälzel Metronome."

Named after the Inventor Johann Mälzel who is the person who first manufactured a metronome for widespread use (although he did was not the first person to invent such a device, that honor went to Dietrich Nikolaus Winkel).

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  • Comments are not for extended discussion; this conversation has been moved to chat.
    – Richard
    Apr 5 at 12:07
1

Metronome Mark sounds reasonable!

1
  • Comments are not for extended discussion; this conversation has been moved to chat.
    – Richard
    Apr 5 at 12:07

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