Publisher Desc.  This innovative software series enables your Disklavier Mark III piano to perform with the world's most popular CDs! Using Yamaha's PianoSmart Technology, this companion diskette will magically empower your Disklavier Mark III to accompany the exciting audio performance from the designated CD. (Use only the CD listed. The commercial CD is NOT INCLUDED and must be purchased separately.) Includes 21 songs: It Came upon a Midnight Clear; Christmas Waltz; Sleigh Ride; The Christmas Song; O Holy Night; Ave Maria.