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

matter of life or death / (idiomatic) an extremely urgent matter

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

viewing as a problem

to view as a problem

set of problems