Continuum Books late last week announced a whopping 21 new titles in its 33-1/3 series to be published in 2007 and 2008. The series, which offers novella-length examinations of seminal rock albums as seen by music critics (Jim Fusilli on Pet Sounds) and musicians (Franklin Bruno on Armed Forces), will take on a wide range of musical styles over the next two years, with monographs covering everything from Stevie Wonder’s Songs in the Key of Life to the Guns & Roses double-LP Use Your Illusion, with Tom Waits’ swordfishtrombones and the Magnetic Fields’ 69 Love Songs thrown in for good measure.