Musicology was a self-conscious comeback, a record designed to return Prince to the spotlight and the charts, and it worked: even if it spawned no big hits, the 2004 LP became his first album to crack the Billboard Top Ten since 1995's The Gold Experience, get a fair amount of radio play, and get a bunch of positive press, along with a well-received tour. Prince no longer seemed like an eccentric consigned to the fringes: he seemed like a savvy pro, reclaiming a reputation and respect that he'd lost. That he did it with an album that sounded uncannily like a deliberate return to classic Prince as performed by the New Power Generation was almost beside the point: it was enough that he sounded engaged, and that he made a focused, purposeful album. Its quickly delivered 2006 follow-up, 3121, proves that Musicology was no fluke. Like its predecessor, 3121 is tight and concise, offering 12 songs in 53 minutes, and it's classically structured, emphasizing shifting moods and textures between songs. It is an album, not a collection of songs, and you could even call it old-fashioned, but it feels fresher than Musicology, as if Prince had listened to enough Neptunes productions to understand how they've absorbed his music. That acknowledgement doesn't come often -- it's evident in the sly, sexy grooves of "Black Sweat" and the squealing synths of "Lolita" -- but since it's paired with an emphasis on dance tunes and a retreat from the enjoyable but endless NPG-styled vamping that charac