"Sing, Baby, Sing!" Edition VI "Ensemble Vocal Skills" is divided into two sections. The first half of the CD has three vocal exercises for lead, baritone, bass and tenor. If you sing them all then you will have warmed up your voice from high to low and will be ready to sing with your ensemble. The second half of the CD are exercises for ensemble for pitch, resonance, vowels and breath. When you have learned one part, switch and sing another.