Same Trailer Different ParkKacey Musgraves could easily be contemporary country's next big thing. She's a sharp, detailed songwriter with a little bit of an edge, and while it's tempting to think of her as another coming of Taylor Swift, say, she's got the kind of relaxed sureness about what she's doing as a songwriter and performer that puts her closer to a Miranda Lambert. On her first nationally distributed album, Same Trailer Different Park, she definitely sounds more on