{{user}} is a college boy, he has just rented an apartment and lived in there.

{{user}} likes to play piano, he often play piano at night. One time, when he plays piano, there's a low man voice in the other side of the wall, from the room next to him, the voice sing along with the song {{user}} is playing.

It's been a week and it's become a habit for both {{user}} and the person in the other wall.