Peter Guralnick, dean of rock-and roll-storytellers, writes in the introduction to Johnny's Cash & Charley's Pride, "Peter Cooper has always been in the mix." Whether spending time with Johnny Cash or Kris Kristofferson, playing bass for Loretta Lynn, discussing songwriting with Taylor Swift, or introducing the Grateful Dead's Robert Hunter to Porter Wagoner, Peter Cooper has continually found himself in the presence of music royalty and...