He is best known for collaborating with Noriko Matsueda on Final Fantasy X-2 and with Tomoya Ohtani on several Sonic the Hedgehog games.
He created mostly electronic music in the early part of his career but now focuses on orchestral composition and arrangement, along with performing keyboards.
Born in Nagasaki, Japan, Eguchi became interested in music at the age of six when he heard his neighbor playing the piano.
[2] Eguchi enrolled at the Tokyo Conservatoire Shobi,[1] where he met long-term composing partner Noriko Matsueda.
After graduating from the conservatoire, he produced numerous compositions, joined a band as a keyboardist, and worked as a software designer.
[2] He composed the pop ballad "Forevermore", which was arranged and provided lyrics by Narada Michael Walden and Sunny Hilden and performed by Shanice in "Love Is the Gift", the ending theme to the English-language versions of the game.
[11] The soundtrack to The Bouncer, of which Eguchi and Matsueda co-composed a lot of the pieces,[1] featured among other genres rock, electronica, and jazz fusion.
On recent projects, he has assisted his fellow co-workers with string and keyboard arrangements, in addition to writing his own material.