David Clayton-Thomas, the Canadian music legend and lead singer of American rock band Blood, Sweat & Tears, has died at the age of 84.

According to his publicist Eric Alper, Clayton-Thomas passed away last night at St. Michael’s hospital in Toronto, the cause of death has not been confirmed.

Born David Henry Thomsett on September 13, 1941 in Kingston upon Thames, Surrey, England, he was the son of a Canadian soldier stationed in the UK during World War II and an English mother who was a music student. After the war, the family relocated to Canada, settling in the Willowdale suburb in Toronto. His love of music came from his mother, however he had a volatile relationship with his father which caused him to live on the streets in Toronto at the age of fourteen. After spending years in and out of prison, it was there that Clayton-Thomas found an abandoned guitar and began teaching himself to play, later holding concerts while in jail.

In 1962, Clayton-Thomas stumbled upon Yonge Street’s bustling R&B music scene, finding mentorship with rock legend Ronnie Hawkins who took him under his wing. During his time on the Toronto music scene, he led two bands, David Clayton-Thomas and the Fabulous Shays and The Bossmen, one of the first bands to infuse jazz and rock together. In 1966, with The Bossmen, Clayton-Thomas released the single, “Brainwashed,” the anti-war anthem that was banned in the US but shot up to the top 20 of the Canadian music charts.