Marc Martel, who sings Wally's favorite Christmas song (Downhere's How Many Kings), makes it look so effortless as he belts out What Child Is This?. [fluidvideo url="https://www.youtube.com/embed/_jHobt8JeSg"]   Want to hear Marc sing some more? Wally challenged him to Christmas Karaoke, where they took turns singing lines impersonating famous singers. Marc's Michael Jackson impression is spot-on. [fluidvideo url="https://www.youtube.com/embed/LrC30sJhvXw"]   You can also watch Wally try to accompany Marc on ukulele, and hear Marc tell us what Canadian Christmas is all about.