cool stuff to use

Sheet music for what? Because putting it in your games in illegal...I don't know if you not making profit from it makes it less illegal..

But for personal use, downloading music is totally legal, but sharing it and stuff is the bad part. So, if you want some sheet music to learn and play, or the music to listen to on what not I think that's totally legal! 

Putting it in your games and not getting profit is fine. It has a name for it, I think. Getting a profit, the makers probably still won't care.

I know that...but it's best to use songs from games that people made midis from, because there is no copy on it. Because the people made it, unless they put one on it.