Remixing and posting a song is legal and is fine with YouTube's agreements. If you didn't make the MIDI file then ask the owner about posting it (leave names in description for example).
You can disagree with the decision freely. They themselves said remixing music is legal and allowed. Playing self-written MIDI files is remixing, because MIDI files are often made with a MIDI keyboard, meaning, that someone has had to play the song themselves with their fingers (there are some MP3 to MIDI converters too I guess, those aren't really legit afaik).
If it was illegal then all songs you hear in a concert theater, theater, school, streets, cruise ships, restaurants and bars, clubs, home, friend's house... they'd all be illegal, so yeah, it's legal because it's legal to remix a song - reproducing is the same category. If it was illegal you wouldn't even be able to sing or play a Christmas jingle to your family.
Last edited by Socialz; Dec 14 2013 at 04:26 PM.
[b]Nimrodel [SIZE=1]~ Flock of Moosen[/SIZE][/b]
[size=1][b]Linyc Thequar[/b], Champion 100[/size]