Hmm, I think I know what's going on then. It's registering the song being performed by other groups. These were the two songs listed. I'm going to look into Twitch and see if I can contest these claims.
Act 1: Scene 1: "Overture - Decoration Of The Christmas Tree" by Bolshoi Theatre Orchestra
Tchaikovsky: Nutcracker Suite, Op. 71a - March by Paris Conservatoire Orchestra, Anatole Fistoulari