Streaming may offer a new way of consuming music, but that does'nt mean that the music being consumed is new. Classic holiday songs remain popular, whatever the format. That's the takeaway from a new chart provided by SoundExchange. Johnny Mathis is still #1 with Bing Crosby and Nat King Cole still in the Top 15. But while you won't find any Pitchfork favorites on the list., there are a couple of surprises.