The good news is that i finally got approved to upload music onto Newgrounds! Yay! The bad news is that while trying to upload my second piece, I found out that Newgrounds has an audio upload limit of 8mb, which my second piece exactly fits! So now Newgrounds won't accept that song until it's smaller, and of crappier quality. This means even more bad news because the song I was trying to upload was only 7 minutes long and for one instrument. Most of my works are shorter than this, but some of my best happen to be a bit long, featuring multiple instruments.
It looks like I'll have to take care of this in two different ways: For songs that are just barely over 8mb I'll have to shrink the file, taking just a minimal cut in sound quality (just for the newgrounds versions), and for songs that well exceed the limit I'll have to upload them in movements. Another solution, I suppose, would be to just leave newgrounds for a website that's serious about classical music, but I don't think I'd have any luck there. What a delicate quandary.