Hal Leonard Songs Children Can Sing! - Pro Vocal For Kids Vol. 1 (For Boys And Girls) Book/CD Pro Vocal Boys' & Girls' Edition Volume 1 Series: Pro Vocal Format: Softcover with CD Composer: Various The CD is playable on any CD player, but also enhanced so Mac &amp; PC users can adjust the recording to any pitch without changing the tempo! Perfect for home rehearsal, parties, auditions, corporate events, and gigs without a backup band