Someone discovered the piano. That someone was also getting pretty sick of an ongoing loop of the same three songs.

"Hey, Zack? You can take a break. I'll handle the music for a bit." Yeah, on top of everything else, he's also a pianist. Reid sipped the apple cider he was drinking, then put it carefully to the side before sitting at the piano bench. As he experimentally played a couple scales to see if it needed tuning, he called to the house, "Does anyone have any requests?"

Who knows? Perhaps everyone could start singing Christmas Carols while he plays along.