I wasn't sure what theme this would fall under; so, I chose free day for this one. I have a headcanon that Walter played classical piano (mostly Beethoven but also Mozart, Bach, etc.) as a child. At first, he did it because his mother wanted him to learn to play piano, but after a while he began to play as a way to vent his feelings. Although he never understood why he did it, Megan figured it out and asked him to play for her when she knew he was upset or stressed. He did so to make her happy, and eventually, Megan could tell how he was feeling by the way in which he played a song (softly, aggressively, etc.). He would play at odd hours, and it drove his parents crazy. Since Megan understood, whenever he would get into trouble, Megan would lie and say that she asked him to play for her. He stopped playing after he moved away from home. He bought the piano in the garage intending to start again, but he never had time to play, but... Whenever he misses Megan, he goes downstairs when he knows everyone is gone and plays her favorite song.