Grammy winner and two-time Rock & Roll Hall of Fame inductee (as a member of both The Byrds and Crosby, Stills & Nash) chats about his remarkable career, including producing the debut album for then-girlfriend Joni Mitchell, the song he wrote as a message to George Harrison, his magical connection with Jerry Garcia, the song Jackson Browne forced him to finish, the writing partner with whom he has the best chemistry, and why he's blown away by Marc Cohn, Shawn Colvin, Sarah Jarosz, and Jason Isbell.