Christmas Canon
"Christmas Canon" is a Christmas song by the Trans-Siberian Orchestra from their 1998 album The Christmas Attic. It has debuted on the iTunes Top 100 download chart at #48 during Christmas time.
The song is set to the tune of Johann Pachelbel's Canon in D Major with new lyrics added. The group's rock version is entitled "Christmas Canon Rock", which debuted on their 2004 album The Lost Christmas Eve.
Source: wikipedia