"A Singular Christmas" was composed and rendered in 2004 by Brian Whitman. It is the automatic statistical distillation of hundreds of Christmas songs; the 16-song answer to the question asked of a bank of computers: "What is Christmas Music, really?"
A Singular Christmas (2004)
The Echo Nest
Music Information Retrieval by Downie
Music Retrieval: A Tutorial and Review by Nicola Orio
Music Information Retrieval (Wikipedia)