Kenji Yamamoto (山本 健誌, Yamamoto Kenji) is a Japanese video game musician working for Nintendo. He was born on April 25, 1964. He is notable for composing music in many titles of the Metroid series, mainly Super Metroid and the Prime trilogy. Yamamoto also plays a role as a music director at Nintendo, overseeing the audio for several Nintendo games. He often collaborates with Minako Hamano. In development of Super Metroid, Yamamoto came up with some of the games' themes by singing them while riding his motorcycle. He was asked to compose the music for Metroid Prime to reinforce the series' continuity. Metroid Prime's Dolby Pro Logic II surround sound was mixed by a member of Dolby Digital. Developers from Retro Studios noted how the process of fitting all the sound effects and music for Metroid Prime in 6 MB of space was crucial in producing a quality soundtrack, as each sound had to be of very high quality to be included. Yamamoto utilizes heavy drums, piano, voiced chants, clangs of pipes, and electric guitar.