One of his favorite songs is Stressed Out by Twenty One Pilots. Why? He relates to it, on many levels. He feels the lyrics speak to him on a level he can't put into words.

On good days, he'll listen to it for the beat.

On bad days, he'll listen to it for the weight of the lyrics.

Matthew gets worried every time because he never knows if it's a good time or a bad one.

So the song is above in the form of an AMV which is what gave me the idea you must watch it-