Yamamoto also plays a role as a music director at Nintendo, overseeing audio for several of their games.
He frequently collaborates with fellow composers Minako Hamano and Masaru Tajima.
Yamamoto's music utilizes heavy drums, piano, voiced chants, clangs of pipes, and electric guitar.
[1] In development of Super Metroid, Yamamoto came up with some of the game's themes by humming them to himself while riding his motorcycle home from work.
[4] Developers from Retro Studios noted how the process of fitting all the sound effects for a world in Metroid Prime into 6 MB of space was crucial in producing a quality aural experience, as each sound had to be of very high quality.