POP-ROCK

COLDPLAY fan alert: The atmospheric rush of "Speed of Sound" previews Chris Martin (left) and crew's next CD, X&K at iTunes.com.

BOB MARLEY'S "Africa Unite" gets a rousing hip-hop injection with a remix by Black Eyed Peas' will.i.am featuring Marley's original backup singers and his widow, Rita Marley, with proceeds going to charity, at iTunes.

YING YANG TWINS crunk up the beats with "Wait (The Whisper Song)," a club banger from their upcoming CD U.S.A. (United States of Atlanta), at Napster.com.

THE WHITE STRIPES' new single "Blue Orchid" opens with a bang, never letting up on the hard-hitting bass before coming to a sudden halt—a perfect tease for the June 7 release of the duo's fifth disc, Get Behind Me Satan, at iTunes.