A lot of music freaks fall prey to the grass-is-always-greener syndrome. We listen online to exotic London pirate radio broadcasts, scan the Web for the best Indian bhangra-beat stations, long for the shock-of-the-new epiphany that undoubtedly exists in another radio universe. But heard with alien ears, the reggae, dancehall and reggaeton mix that airs Wednesdays from 5 to 6 p.m. on the Beat (100.3 FM) is a new world, a melting pot of hip-hop and Caribbean sounds that signals a sea change in the world of pop music. DJ Dwight Stone blends a cappella hip-hop vocals over dancehall instrumentals, merges heavy riddims with Jay-Z, transforms Usher into a toastmaster extraordinaire, moves Missy Elliott to Kingston. Sure, it's the pop stuff; it's not the hardest, deepest, most cutting-edge dancehall, but we guarantee that if Stone were spinning this stuff in the hippest club in London, the room would explode and the kids would be amazed that the mix is broadcast weekly on a St. Louis radio station.