“"Hi, I'm Sean Lennon and you're listening to Jurassic 5." This is not the kind of endorsement that instills high hopes in listeners. Yet, there he is, offering his phoned-in cameo seconds before a song called "Great Expectations" kicks in. Fortunately, the announcement comes after the Jurassic 5 have set themselves apart from the ranks of standard-issue underground hip-hop collectives and stagnati”