After being hotly anticipated for months- at least by stores- All Hallows' Eve is finally here. If you're at all concerned, the so-called North American Halloween Prevention Inc. has released a charity single, "Do They Know It's Halloween?" (It's really a spoof of the well-intended-but-slightly-patronizing "Do They Know It's Christmas?") It features a slew of Canadian musicians, including Arcade Fire, Buck 65, Sloan, Feist, and Wolf Parade; even better, all proceed go to UNICEF.......