[thought I'd answered this already. must have missed clicking the submit button]

Yes, it's legal to download the magnetmix material http://www.magnetmix.com/faq.shtml

Although all their files don't show a CC license in LW (control-click/right-click the Library's column header to turn on the license column), the David Byne song does have the new embedded license. Control-click the filename in the Library to view the license.

btw--check out their video entries. "The Share" episdoes are quite entertaining, and account for most of my uploads the last few days.