You know a rapper's future is in trouble when he gets arrested for a bar brawl two weeks before his CD drops, and hardly anyone notices or cares. The only thing more embarrassing for Brooklyn's Memphis Bleek on 534 is that he's absent from his fourth CD's finest track, ''Dear Summer,'' a Just Blaze-produced hip-hop/soul jam that finds Jay-Z passing the torch to his consistently unimaginative apprentice before leaving him to limp across an uneven mix of contrived party songs and well-produced yet lyrically insipid street tales.

