Book/CD. Fundamental Vocal Techniques for Classroom and General Use. Have fun with your choral warm-ups! With this collection of 54 inventive and educational songs and exercises, your choir will beg for more. Start out with the unison pieces and 'build' to the more challenging exercises for 2-part, 3-part or 4-part treble or mixed voices. Use the demonstration CD for quick learning or sing along with the recording to have hands-free, protable warm-ups at your fingertips every day.