Earlier this week on Soundcheck, blues guitarist Buddy Guy revealed that he seldom practices. However, saying that music comes "naturally" to him -- or other artists -- may be an oversimplification. Neuroscientist Daniel Levitin and musician Victor Wooten join us to discuss music and the brain. Later: Howard Fishman is once, twice, three times a singer-songwriter. He performs selections from his three new albums live in the studio.