TSO

Trans-Siberian Orchestra, a rock/metal orchestra, is amazing beyond belief in my opinion. Most of their music is Christmas or has a dark tone to it. A great example of what they are is:

http://listen.grooveshark.com/#/search/songs/?query=christmas%20eve%20sarajevo

Just pick any of the songs by TSO, and it should be the right one. In an actual concert there is also a story to go with all the music in the first half, and generally all of the second half is music. It is a very long concert, the last one I saw was about 6 hours long. It is well worth the money, and time. Hope you like them as much as I do.