(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 eight hit songs. The audio tracks contain demos for listening, and separate backing tracks so you can sing along. Perfect for home rehearsal, parties, auditions, corporate events, and gigs without a backup band. Eight songs: California Gurls * Firework * Hot N Cold * I Kissed a Girl * Last Friday Night (T.G.I.F.) * Part of Me * Teenage Dream * Wide Awake.