Vocal Sampling, a group from Havana, Cuba, is nominated for three Latin Grammys tonight. They make unusual a cappella music, using their voices to imitate Cuban instrumentation. Reviewer Felix Contreras says that on this CD called Cambio De Tiempo these schooled musicians have put together a great mix of Cuban styles and have mixed it up with hip-hop and jazz — all with their mouths. (4:30) The CD is called Cambio De Tiempo by Vocal Sampling on Ciocan music. See http://www.ciocanmusic.com.