It's 'Cry Little Sister' by Aiden, it's a cover they made of Gerard McMann's original (as heard in the 1987 one) for The Tribe... and they're apparently re-using it for The Thirst. Not that I mind though, it's a good song. =D
Thanks, ladies! I really enjoyed what little I heard from the trailer so I wanted to check out the whole thing. And I did a little research on the movie. Apparently it came out today, so I'd think only the truly die-hard fans would have seen it already.
I made the mistake of running out the day The Tribe came out and paying about $20 for it. It can now be found on the $5 rack at Wal-Mart. I think I'll wait a bit for this one. =P Are you planning on seeing it soon?