New CDs: Lonely Island.

LONELY ISLAND ''Incredibad'' (Universal Republic) With apologies to Debbie Harry, Tairrie B, Invincible and Amanda Blank, the most significant white female rapper of all time is Natalie Portman. (To Northern State and Uffie, no apology is necessary.) Based on Eazy-E's ''No More ?'s,'' ''Natalie's Rap,'' which originated in 2006 as a ''Saturday Night Live'' sketch written by Lonely Island -- and appears on this comedy team's first musical album, ''Incredibad'' -- is savagely funny, a reputation changer for a young actress and, most surprisingly, an utterly convincing revisiting of late-1980s Los Angeles gangster rap. It isn't parody; it is a love letter. [ABSTRACT FROM PUBLISHER]