they perform a medley of timeless holiday classics by -- classics by ervin burling. >> i love that onetheatre. >> welcome to the stage... [cheers and applause] [♪] [singing] [singing] [singing] [singing] [singing] [singing] [singing] [♪] [singing] [singing] [singing] [cheers and applause] >> let's give another big round of applause for moon school. [cheers and applause]. >> weren't they wonderful? >> they were so wonderful. i love all of those songs. >> our next act has appeared on national and international television. they have toured internationally to england, argentina, and mexico. >> ages seven, 10, 11, and 13. here they are. the most musically talented siblings, stars aligned! [indiscernible] [♪] [♪] [cheers and applause] [♪] [♪] [cheers and applause] [♪] [♪] [cheers and applause] [cheers and applause] >> all right, it is a very, very special time of night. are we ready? >> i think we are ready. oh, boy. >> time to light the christmas tree? >> are you ready to light the christmas tree? [cheering]. >> we have to get some special guests up here tonight. are special guests include