(Piano Duet Play-Along). The great Wicked songs arranged as piano duets! The book also comes with access to online audio that features separate tracks for the Primo and Secondo parts perfect for practice and performance! 8 selections from the hit musical, including: Dancing Through Life * Defying Gravity * For Good * I Couldn't Be Happier * I'm Not That Girl * Popular * What Is This Feeling? * The Wizard and I. Audio is accessed online using the unique code inside the 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.