Regardless of the legality, it's just a dick move not to even try to contact the musicians for permission. Heck, even they had a license that specifically encourages doing so, I'd ask first anyway. It's just common courtesy.
That said, sync licensing has LONG been separate from any other forms of licensing so even the argument that any copyleft license aught to grant sync rights - if not in a true legal sense, at least just in terms of common practice - I don't think I agree.
I think that in general, a copyleft license can be thought of as a notice of legality and intent. It states, "Hey, you can't do this and this but you can do all these things if you want to." but it's common courtesy for those who actually take advantage of the license to contact the original author (at the very least, it covers your ass in case you misunderstood the license as was the case here).
Last edited by jefftheworld (Oct 5, 2013 9:19 am)