Very little that is posted on Youtube has ANY legal right to be there... Just about every music clip up there has no permission from author or publishing or record company.

It's only going to be an issue if you use commercial SMF tracks for a commercial CD release, and even there it is poorly policed. Let's face it, few SUCCESSFUL label releases are ever going to use a commercial SMF as backing, and if you sell them out of your car trunk or private website, their monetary value is going to be less than the cost of litigating.

The main thing I've seen the SMF people (Tune1000, etc.) do is go after sites that offer their SMF's up wholesale, as this impacts what they DO make. I don't think I've ever heard of a case of them suing someone that used their SMF to make a hit record!

Cassp is right... if you find a copyright in the file's properties, and want to be strictly legit if you are selling CD's, you can always buy it from them, and you are good to go.

But if you just want to post a demo on YouTube, I doubt this is an issue...