Songs in the Broadway Singer's Edition include the vocal line and lyrics paired with faithful reductions of the orchestral accompaniments. The songs are presented in their original keys with piano accompaniments carefully crafted for playability. The audio includes performances of these piano accompaniments. Includes these hits from Wicked: Dancing Through Life · Defying Gravity · For Good · I Couldn't Be Happier · I'm Not That Girl · No Good Deed · Popular · What Is This Feeling? · The Wizard and I · Wonderful. 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.