>DAVID GUETTA recruits Taio Cruz and Ludacris for the techno-pop jam “Little Bad Girl,” from the French deejay-producer’s next album, Nothing but the Beat, which arrives Aug. 30. $1.29 at rhapsody.com.
BJORK fuses both electronica and tribal rhythms on “Crystalline,” from Biophilia, her upcoming seventh solo studio album. $1.29 at napster.com.
DANNY GOKEY, 2009 Idol finalist, previews his next album with “Second Hand Heart,” a country-rock confection. $1.29 at zune.net.
MARY J. BLIGE (left) wails the uplifting ballad “The Living Proof,” from the anticipated film The Help, due Aug. 10. $0.99 at amazon.com.