I realize this is far away from thrash metal, but a few past members have been in Testament or Megadeth and such! Hopefully there is an exception due to lack of Christmas songs in thrash metal besides the other one (Fuck Christmas by Tankard). This is Savatage’s side project, headed by Paul O’Neil to create big rock-operas that are impressive to witness live. And honestly, this song is probably THE closest these guys ever get to thrash lol.

Youtube, Spotify, no Bandcamp for this one womp womp, RateYourMusic, Encyclopaedia Metallum