To commemorate hitting the 15-year mark, the Red Hot Chili Peppers reunited with guitarist John Frusciante and producer Rick Rubin (from 1991's triumphant Blood Sugar Sex Magik) and headed for the studio. With the band having matured at least a little in those years, Californication contains more sun-baked slow ones than your usual RHCP disc, but that doesn't mean the fire's gone out. Frontman Anthony Kiedis seems comfortable in his mellower "Under the Bridge" mode, singing about home and relationships instead of spieling out hard-partying raps. Frusciante is back in form, unraveling cheerful, tricky Hendrix homages, while bassist Flea and drummer Chad Smith remain a nonpareil funk-rock rhythm section, locking in and grooving whenever they get the chance. All fronts come together on the breathless new wave of "Parallel Universe," the taut and snappy "I Like Dirt," and "Right on Time," an ultra high-energy snatch of disco. It's on songs like these, when the Chili Peppers hit that perfect beat, that you can almost hear the grins spreading on the band's faces.