Such a tear jerker performance
Melody is a song from famous singer Tamaki Koji. There's a comment on that video from i assume a Tamaki Koji fan that said:
"I swear, after listening many renditions of this song, from pro singer included, You're the only one that can move my heart aside from Tamaki Koji himself."
Sadly the comment somehow disappeared. Last time it have 4 comments on it, now it's only 2 left.