New Orleans singer, songwriter and producer Allen Toussaint died on Monday of a heart attack at age 77. Toussaint’s influence spread to such artists as the Rolling Stones and Elvis Costello, both of whom recorded Toussaint’s songs or collaborated with him. “I don’t want y’all thinkin’ ‘this is just some old legend that passed away’ naw,” Questlove, founding member of the hip-hop group The Roots, wrote. “This dude wrote some of your favorite music & you just didn’t know it.”