music therapy

concert (a musical entertainment in which several voices or instruments take part)

(music) classical music

rhythm game (genre of video game)

musicology

light music (such as popular songs, jazz, chanson, etc.), as opposed to classical music / semiclassical music

(computing theory) Turing complete

band (almost always a brass band formed from members of bodies such as the military or police)

perfect and without blemish; flawless

(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself