Watanabe was born on 1 February 1933 in
Utsunomiya, Japan. His father, a professional musician, sang and played the
biwa. He learned the clarinet while in high school after convincing his father over the course of six weeks to buy him a second-hand instrument. In 1961, his first album as a leader, the self-titled
Sadao Watanabe, was released. In 1962, he left Japan to study at
Berklee College of Music in Boston. There, he became the director of the new Yamaha Institute of Popular Music, a school that based its curriculum on Berklee's. By the time Watanabe played at the
1970 Newport Jazz Festival, he was a well-known and often highly-regarded jazz performer. Watanabe continued performing and recording throughout the 1970s and 1980s, amassing a catalogue of more than 70 albums as leader. Watanabe has been in charge of the visiting professor of Jazz course at
Kunitachi College of Music since 2010. ==Honors==