Each book in the MIDI Play-Along series comes with a 3.5? MIDI disk of complete professional performances, and includes matching custom arrangements in Easy Piano format. With these books, you can: Listen to performances of each song; Play the easy piano arrangements along with the performances; Remove the melody 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. Songs: Angels We Have Heard On High Deck The Hall Ding Dong! Merrily On High! Go, Tell It On The Mountain God Rest Ye Merry, Gentlemen Good Christian Men, Rejoice It Came Upon The Midnight Clear Jingle Bells Lo, How A Rose E'er Blooming O Come, All Ye Faithful (Adeste Fideles) O Come, O Come Immanuel O Holy Night Once In Royal David's City Silent Night What Child Is This?