Consider going to an NAC performance! Check out the Christmas schedule.
Ottawa Public Library: Your best bet for Classical music, stream online from Naxos. You might want to try to search something more specific than just Christmas. Christmas Carol, Christmas Choral, Christmas Orchestral bring up tons of results in a more specific Classical genre. Christmas Festival is a great search too. Classical Kids Christmas includes narration and translations of tons of Christmas music. I enjoy Bach’s Christmas Cantatas; you can find them in Gardiner’s Bach Cantatas vol 14 and others.
Ottawa Public Library: Freegal will find you familiar Christmas tunes sung by a vast array of famous faces…from Frank Sinatra to Barry Manilow, Cindi Lauper to Barbara Streisand.
CBC Concerts on demand: Enjoy streaming music through CBC’s website.
(all underlined texts are links)