In the newest scratch mag they have a link to rumblefish.com a music licensing store that can be used to easily clear samples. everyone should check this site out cus it seems like it could be useful.
It doesn't say "click here to clear your sample"... geez...
You buy a license to w/e track... I read this in Scratch and have been meaning to check it out...
Seems pretty straightforward. You pay for a license to use the work. I checked for a few of my 'go to' artists when it comes to sampling... and a few weren't there... a few were... hopefully they'll be adding additional artists...