Only 21 when he became famous for playing the signature organ riffs on Bob Dylan's "Like a Rolling Stone," Al Kooper has a list of credits that could fill this magazine. He started Blood, Sweat & Tears and discovered, signed and produced Lynyrd Skynyrd. He played on hundreds of sessions including working with the Rolling Stones and Jimi Hendrix. He has held A&R positions, taught at the Berklee College of Music, survived a brain tumor, coped with vision loss and, of course, recorded solo albums. "Black Coffee," his seventh solo set and first in 30 years, comes out July 12. Kooper, 61, spoke to Billboard from his home in Boston.