Greatest Christmas Songs is essentially a reworked version of Henry Mancini's 1966 album Merry Mancini Christmas.
All the songs from that original release are here, plus four extra tracks: "Snowfall," "Baby It's Cold Outside," "White Christmas," and a New Year's-themed medley.
It's a welcome return to the Mancini catalog, especially considering that Merry Mancini Christmas was the only holiday record ever done by the master of American orchestral pop.