Got true ending and beat all DLC. I've never hated and loved a game so much in my life. Beating The Final Song took about 15 attempts but I finally did it! I really couldn't stop shaking near the end and my heart was beating so damn fast... You can actually hear me laugh at 16:50, I had so much built up energy that it just came out all at once at that point:
https://www.youtube.com/watch?v=YYkxx_RJEM0