Thomas, whose soulful vocals powered the hits “Spinning Wheel” and “You’ve Made Me So Very Happy" for the rock-jazz fusion group Blood, Sweat & Tears in the late 1960s, has died.

The group had big hits with “You’ve Made Me So Very Happy” and “And When I Die,” but the singer left the band in 1972.

A memorial concert for the vocalist, who sang "You've Made Me So Very Happy," is in the works ...

After years in prison, the Toronto native came to New York and led the brassy rock outfit on “Spinning Wheel,” “And When I Die” and “You’ve Made Me So Very Happy.” ...

Clayton-Thomas is best known for late 1960s hits like “Spinning Wheel,” “And When I Die” and "You Made Me So Very Happy." ...

David Clayton-Thomas, who fronted Blood, Sweat, and Tears during their most popular period, died "peacefully," according to a press notice, in Toronto on Tuesday. A cause of death was not made public.