David Clayton-Thomas, the lead singer of Blood, Sweat & Tears, has died at the age of 84. A spokesperson confirmed that Clayton-Thomas died Wednesday at St. Michael's Hospital in Toronto. A specific cause of death was not cited.

Clayton-Thomas, a Canadian-born former street fighter and petty thief, rose to become a rock superstar as the frontman for the nine-member group. Blood, Sweat & Tears sold millions of records and won two Grammy Awards, including best album of 1969 for their self-titled release, which surpassed The Beatles' "Abbey Road." Clayton-Thomas's distinctive, urgent vocals on hits such as "Spinning Wheel," "And When I Die," and the Motown cover "You've Made Me So Very Happy" became a signature sound of the era.

His voice, often described as husky and high-strung, propelled the band's unique blend of rock, jazz, and funk. Blood, Sweat & Tears was known for its complex arrangements featuring a prominent horn section, influencing other bands like Chicago and Ten Wheel Drive. "I was just a blues player: give me three chords and I’ve got a song," Clayton-Thomas said in a 2023 interview.

The band's broad appeal extended beyond typical rock audiences, leading them to perform at the 1969 Woodstock festival and, in 1970, to tour Eastern Europe on behalf of the State Department. This tour occurred as Clayton-Thomas, who had faced issues with his U.S. green card and faced deportation, was seeking to solidify his status in the United States. The band's album "Blood, Sweat & Tears 3" topped the charts in 1970.

Clayton-Thomas left the group in 1972, a period marked by burnout, though he and the band would later reunite. He embarked on a solo career, releasing more than a dozen albums and touring for decades. His path to New York and the formation of Blood, Sweat & Tears began after bluesman John Lee Hooker encouraged him to move to the city. When Hooker unexpectedly left for Europe, Clayton-Thomas was recruited to perform at the Cafe Au Go Go.

Around the same time, session musician Al Kooper was forming a jazz-rock group that became the initial iteration of Blood, Sweat & Tears. After the band's debut album "Child Is Father to the Man," internal differences led to the departure of Kooper and others. Judy Collins recommended Clayton-Thomas to drummer Bobby Colomby, who was seeking a new lead singer. Clayton-Thomas joined the remaining members, and their first rehearsal led to what he described as "instant magic."