MUMU is a Japanese math rock/avant-jazz/prog trio and nickname of drummer/composer Masahiro Uemura.

Besides being a math rock musician, Mumu is an actual professional mathemetician -- a professor at Tokyo University -- and uses his skills to bring lab-coat and slide-rule complexity to his compositions, while jazz-style soloing rounds out the sound produced by the drums, keyboards, and trombone.
Many bands try to get crazy by playing odd time signatures, but Mumu gets even weirder: instead of changing up how many eighth-notes make up a measure, he keeps the measures the same length AND SPEEDS UP OR SLOWS DOWN THE NOTES to fit more or fewer notes in a measure, a technique called "Rhythmic subdivision," also used by Frank Zappa.

Mumu is fond of polyrhythms as well, with drums and keyboards in different time signatures, with the trombone soloing all over the place.

Other groups Masahiro Uemura has been involved with include Kalo, P.O.N., and Ground Zero.

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