R.E.M. marked the point when post-punk turned into alternative rock. When their first single, "Radio Free Europe," was released in 1981, it sparked a back-to-the-garage movement in the American underground. While there were a number of hardcore and punk bands in the U.S. during the early '80s, R.E.M. brought guitar pop back into the underground lexicon. Combining ringing guitar hooks with mumbled, cryptic lyrics and a D.I.Y. aesthetic borrowed from post-punk, the band simultaneously sounded traditional and modern. Though there were no overt innovations in their music, R.E.M. h...