John Wallace, known as "Big" John Wallace, is a distinguished bassist and singer who gained prominence as a backup singer and musician for the renowned singer-songwriter Harry Chapin. Wallace's musical journey with Chapin began in 1971 when he responded to an advertisement in the Village Voice, which led to his membership in Chapin's band. Alongside other musicians like cellist Tim Scott and guitarist Ron Palmer, Wallace became an integral part of the ensemble.

During his decade-long tenure with Harry Chapin, Wallace contributed significantly as a bass guitarist and backup vocalist. He was particularly noted for his impressive vocal range, performing high head tones on songs such as "Taxi" and baritone parts in tracks like "Mr. Tanner" and "30,000 Pounds of Bananas." His collaboration with Chapin lasted until the latter's untimely death in 1981.

Beyond his work with Chapin, Wallace lent his vocal talents to the 1980 film "Popeye," providing the singing voice for the character Bluto. He also formed a band called The Strangers, which included fellow Chapin band members Doug Walker and Howie Fields, and newcomer Malcolm Ruhl. Although The Strangers focused on more conventional rock music, the band was short-lived.

In 1991, Wallace reunited with the Chapin band under the leadership of Steve Chapin, Harry's brother. Together, they continue to perform as the Steve Chapin Band, occasionally expanding to include other Chapin family members. Wallace's enduring legacy in music is marked by his versatile vocal abilities and his contributions to the memorable sound of Harry Chapin's music.