Jennifer Lopez, ''Invading My Mind''
Remember when the thought of Jennifer Lopez releasing good music was as likely as a sequel to Angel Eyes? Well, our bad. The American Idol judge shot up the charts with the cheesetastic Ibiza chant ''On the Floor.'' Now she unites with Gaga pal RedOne for this appropriately named piece of pop pleasure: Once the club banger hits your ears, good or bad, you won't be able to get it out of your head. B+ Tim Stack
Rihanna, ''California King Bed''
Yes, there's the absurdity of naming a song after something you buy at Pottery Barn. (Did Katy Perry have dibs on ''Persian-Style Rug''?) But that's really the only knock against this fourth single off LOUD. ''California'' is irresistibly heartbreaking (the gist: We're in the same bed, but it's like you're in Sacramento and I'm in L.A.). Plus, Ri's voice demonstrates more range and power than it has on her most recent hits. B+ Henry Goldblatt