Although he died five years ago, the rapper's catalog continues to grow with this fifth posthumous release, a two CD set of material from the sessions for 1996's ''The Don Killuminati.'' At his best, 2Pac elevated gangsta boasts into poetic, sorrow filled ruminations on thug life. But too often here on Until the End of Time, post mortem producers dilute his power with garish backup singers and pop hooks. Not to worry: A late 2001 'Package gives them another chance to get it right.