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Japanese jazz saxophonist, composer, and arranger, renowned as a key member of the influential jazz fusion band T-Square.Hiroshi Yamaguchi, born in Hiroshima, Japan, rose to prominence as the alto saxophonist for T-Square. Joining in 1993, he became a defining voice in the band's sound for over a decade. Known for his smooth, melodic, and technically proficient playing, he contributed significantly to albums and live performances, co-writing many popular tracks. He left T-Square in 2004 but continues an active solo career and session work.

• Yamaguchi's nickname within the Japanese music scene is "Yamachan".
• He joined T-Square during a period of significant lineup change, stepping into the role previously held by Takeshi Itoh, and quickly became a central figure in their resurgence.
• His sudden departure from T-Square in 2004 was officially attributed to health issues, specifically severe tinnitus (ringing in the ears), which made high-volume performances difficult. Some Japanese music magazines at the time also hinted at differing musical directions as a contributing factor.
• Beyond T-Square, he has collaborated with numerous prominent Japanese artists like Hiromi Uehara (on her album 'Spiral'), Keiko Matsui, and Casiopea members, and leads his own projects like the HIRO'S BAND.
• He is highly respected for his lyrical, emotional playing style and his ability to blend complex jazz harmony with accessible pop and fusion melodies.