Conversation so far:
how did they come up with the composition?
he would come up with the riffs, but I would be the finish guy for that.
I sat down and came up with the chorus, the bridges, and so forth.
Who composed the music?
"'Man on the Moon' was something that Bill [Berry] had, this one chord change that he came in with.
did it take a long time to compose?
I sat down and came up with the chorus, the bridges, and so forth.
I remember we showed it to Mike and Michael when they came in later.
what are the major instruments in the composition?
think Bill played bass and I played guitar; we kept going around with it.
what genre of music is this song?
Man on the Moon" is a mid-tempo country-rock song following a verse-chorus structure.

Question: how many people were involved all together with composing this song?
Self-contained rewrite: how many people were involved all together with composing Man on the Moon (song)?