This first clip is Santa Quodlibet (or: A Christmas Medley that makes no sense), performed by the Boston Gay Men's Chorus in Stars: A Holiday Celebration. December 14, 19, 20, and 21, 2008, at Jordan Hall at New England Conservatory
Here is a clip from the 2008 concert, Silent Night, with guest sololist Claire Phillipe.
You can find more information about the Boston Gay Men's Chorus here. I am sure they would appreciate any support.