FFPACE'S PROFILE

Hi, I'm new at the forums and I'm sure that this question has been asked before, but I couldn't find a thread that dealt with it enough.

I'm planning on just making a small game and posting it up on this website.
I have a couple of video game soundtracks from around the late '90s and I was wondering if it was legal to put some of the tracks from those albums in my game and then post it online on this website.
I wouldn't try to make any profit, of course.
I'm sure that that the lawyers of Square Enix aren't patrolling websites like this all the time, but I just wanted to make sure that I wouldn't get into any sort of legal trouble.
And if the actual MP3s from the album are illegal, would fan-made MIDIs of the songs (with minor changes) also be illegal?

Thanks.