He has ever participated in a lead vocalist of Rats & Star Masayuki Suzuki's solo concert tour.
After Boyo-Bozo broke up, Ishii composed music for a number of other artists including Lazy Knack, Tomoe Shinohara, Masayuki Suzuki, and V6.
Suzuki | Maruti Suzuki | Ichiro Suzuki | David Suzuki | Tadashi Suzuki | Damo Suzuki | Ami Suzuki | Suzuki Hayabusa | Suzuki Swift | Kenzo Suzuki | Suzuki TU250 | Suzuki TL1000S | Yu Suzuki | Suzuki method | Suzuki Magoichi | Suzuki Carry | Shigeyoshi Suzuki | Seijun Suzuki | Masayuki Suzuki | Fuku Suzuki | Anne Suzuki | Suzuki Wagon R+ | Suzuki SX4 | SUZUKI | Masayuki Mori | Mariya Suzuki | Koji Suzuki | Keiji Suzuki | JirÅ Suzuki | Hiroki Suzuki |
In addition to her work as a performer, she has also written songs and lyrics for other singers, including Yukiko Okada, Hiroko Yakushimaru, Hiromi Iwasaki, Masahiko Kondo, Masayuki Suzuki and Tackey & Tsubasa.