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I noticed the Xmas Jam I played last year had some custom tracks and used a lot of regular Quake tracks, so I replaced the standard Quake tracks with these gothic Yuletide/Xmas/Winter ones.
I got a bunch of their CD's from https://noxarcana.com after finding one in a store, but they're on various media sites/services.
There's at least four physical Winter/Yuletide/Xmas CD's plus more digital-only stuff. Of the physical media, I think Winter's Knight and Ebonshire are the two strongest, released 13 years apart.