[1][2] When he was in middle school, he began to compose music using a synthesizer that he bought and his computer,[2] and had also briefly played in a band.
[1] Interested in computers, Yokoyama attended National Institute of Technology, Nagano College, studying electronic engineering for five years after graduating from middie school.
[1] After graduating, Yokoyama worked as a freelancer, writing songs for various artists, before joining the music production company Miracle Bus in 2009,[3] where he began to produce soundtracks for television dramas, anime, and other media.
[4] His first work as a sole composer was the 2011 television drama series Mitsu no Aji: A Taste of Honey.
[3] He occasionally records his score overseas,[4] and improvises instruments that would match the concept of each work, such as using buckets and decking brushes as instruments when recording the soundtrack for Mobile Suit Gundam: Iron-Blooded Orphans.