(Pro Vocal). Whether you're a karaoke singer or preparing for an audition, the Pro Vocal series is for you. The book contains the lyrics, melody, and chord symbols for hit songs. The online audio contains demos for listening and separate backing tracks so you can sing along. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right. Perfect for home rehearsal, parties, auditions, corporate events, and gigs without a backup band. This volume includes 8 favorites from the megahit musical: Dancing Through Life * Defying Gravity * For Good * I'm Not That Girl * One Short Day * Popular * What Is This Feeling? * The Wizard and I.