(Bass Play-Along). The Bass Play-Along series will help you play your favorite songs quickly and easily! Just follow the tab, listen to the audio tracks to hear how the bass should sound, and then play along using the separate backing tracks. The melody and lyrics are included in the book in case you want to sing, or to simply help you follow along. The audio is accessed online using the unique code inside each book and can be streamed or downloaded. 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. This pack includes: Children of the Grave * Iron Man * N.I.B. * Paranoid * Sabbath, Bloody Sabbath * Sweet Leaf * War Pigs (Interpolating Luke's Wall).