By Jim Farber
Updated March 30, 2001 at 05:00 AM EST

If Jeff is the only Buckley you know, you owe it to yourself to catch up with his dad’s amazing legacy. From his 1966 debut until his death in 1975, Tim Buckley created a brand of folk-jazz that never stopped evolving. His earliest songs could be precious, and his final ones amorphous, but most of his music, captured in this well-chosen, 33-song retrospective, ranks among the most romantic recordings of the rock era. And, like Jeff after him, Tim had a voice in a million: He sounded like an angel on earth. A