Jennifer Lopez

The artist formerly known as J. Lo gets back to crooning en Espanol -- something we haven't heard her do in a while. Lopez's Spanish-language songs have always had more of a pulse than most of the rest of her material, but she's particularly vibrant here as she moves away from the hip-hop Gloria Estefan shtick and into a darker, more passionate sound (thanks in part to a fervent tango groove and a particularly amorous accordion). She's also singing better than she ever has before.