Each book in this series comes with a 3.5 inch. MIDI disk of complete professional performances, and includes matching custom arrangements in Easy Piano format. With these books you Listen to performances of each song; Play the easy piano arrangements along with the performances; Remove the moelody and play the lead; Sing along with the full performances; Alter tempo to perform at your own pace; Play the easy piano arrangements on their own without the disk. The disk works with any General MIDI keyboard, regardless of the brand. This pack includes 10 favorite carols, Christmas Time Is Here * Do You Hear What I Hear * Frosty the Snow Man * Happy Holiday * Happy Xmas (War Is Over) * (There's No Place Like) Home for the Holidays * I Saw Mommy Kissing Santa Claus * Jingle-Bell Rock * Merry Christmas, Darling * Silver Bells.