David Clayton-Thomas, the Grammy Award-winning lead singer for “Blood, Sweat & Tears” whose hits like “Spinning Wheel,” “And When I Die” and “You’ve Made Me So Very Happy,” died on Wednesday, his publicist said. He was 84.Eric Alper confirmed that the singer died at a Toronto hospital but did not provide a cause, The New York Times reported.The group’s three biggest hits all reached No. 2 on Billboard’s Hot 100 charts in 1969.“You’ve Made Me So Very Happy” peaked on April 12, 1969, followed by “Spinning Wheel” (July 5) and “And When I Die” (Nov. 29). Each song spent 13...