The music industry's ongoing battle against digital piracy is just the latest skirmish in a long conflict over who has the right to distribute music. Starting with music publishers' efforts to stamp out bootleg compilations of lyric sheets in 1929, Barry Kernfeld's Pop Song Piracy details nearly a century of disobedient music distribution from song sheets to MP3s. In the 1940s and '50s, Kernfeld reveals, song sheets were succeeded by fake books, unofficial...