(Piano Play-Along). Your favorite sheet music will come to life with the innovative Piano Play-Along series! With these book/CD collections, piano and keyboard players will be able to practice and perform with professional-sounding accompaniments. Containing eight cream-of-the-crop songs each, the books feature new engravings, with a separate vocal staff, plus guitar frames, so players and their friends can sing or strum along. The CDs feature two tracks for each tune: a full performance for listening, and a separate backing track that lets players take the lead on keyboard. The high-quality, sound-alike accompaniments exactly match the printed music. 8 of Katy's biggest hits: California Gurls * Firework * Hot N Cold * I Kissed a Girl * Last Friday Night (T.G.I.F.) * Part of Me * Teenage Dream * Wide Awake.