It also marks the return of Tetsuya Mizuguchi, producer on the original Rez and classic titles such as rhythm game Space Channel 5, to full-time work in the game industry. For almost 10 years, he served as the public face and creative lead at Q Entertainment, a studio he co-founded. The team earned a reputation for music games that have become Mizuguchi’s trademark, but as time went on it began to shift focus towards casual online games, leaving less room for Mizuguchi to do what he wanted.

Source: Yahoo Music
Link: Rez producer Tetsuya Mizuguchi on his return to music games