By Chuck ArnoldDavid ChiuRANDY VEST and Jessica Herndon
Updated March 10, 2008 12:00 PM

MARIAH CAREY entices with “Touch My Body,” a smooth and sexy groove from her 11th studio album, E=MC2, out April 15. At

R.E.M. proves that they can still make some supercatchy alt-rock with “Supernatural Superserious,” the first single from Accelerate, due April 1. At

GNARLS BARKLEY returns in innovative style with “Run,” a trip-hop preview of their second album, The Odd Couple, due April 8. At