With respect to my Trans-Siberian Orchestra reference, you might find
this review of their Christmas rock opera interesting. Yes, that's right -- mainstream heavy metal musicians performing a fairly religious Christmas rock opera, Christmas music, and heavy metal treatments of classical music including Pacabel, Bethoven, and O, Fortuna from the Carmina Burana.
With respect to my Trans-Siberian Orchestra referenceTSO's "Christmas Eve (Sarajevo 12/24) is simply stunning.
Heck, even my mom likes it.