Not strictly a Christmas song, but I first heard it on Sufjan’s “Songs for Christmas” album, and for me it’s become particularly associated with Advent — with longing and waiting for God to come, to “tune my heart to sing Thy praise”. As a bonus, you can find out what “Here I raise my Ebenezer” means. And it’s beautiful, in the live version linked here, to hear the audience singing along at the end of the song.