2011 was a fertile year for collaborations, both long-awaited (Jay-Z and Kanye West's Watch the Throne) and out-of-the-blue (King Creosote and Jon Hopkins' Diamond Mine). What else? Oh, just a definitive version of a century-old masterwork (Gustav Mahler's Symphony No. 2) by a storied institution (the London Philharmonic Orchestra) and a couple of debut albums (Kendrick Lamar's Section.80 and La Vida Boheme's Nuestra) that made our heads spin. The list of our 50 favorite albums of 2011 continues here, with albums from Radiohead, PJ Harvey and more artists from K to R.