I've been fond of Straight No Chaser for a long time and finally got the chance to hear them live recently. If this type of music interests you have a look at these Youtube videos. If you want more just search on their name. Happy holidays!
Like a Prayer:
https://www.youtube.com/watch?v=QyQAVhkAwvk
Hark the Herald Angels Sing:
https://www.youtube.com/watch?v=O2PedMcs8fA