Plenty of mashups are entertaining but they are often not actually good. By the time they’re over, you’ve already made the decision never to listen again. This is not one of those mashups. DJ Cummerbund is a true master of the mashup and “Earth, Wind & Ozzys” might just be his greatest work yet. It’s a mashup of Ozzy Osbourne’s “Crazy Train” with Earth, Wind & Fire’s “September” that works unbelievably great.