Concerts and recordings of the works of Julius Eastman — a vibrant composer-performer who was all but lost to history after his death in 1990 — have become reliably important events as his music has resurfaced in recent years.

The revival, which has reached beyond the world of classical music to influence artists associated with avant-rock, will take another important step on Tuesday when the New School’s Mannes Orchestra gives the world premiere of a new edition of Eastman’s Second Symphony (1983) at Alice Tully Hall. Its editor, the composer and musicologist Luciano Chessa, will conduct.

This edition of the symphony was made possible by the composer Mary Jane Leach’s discovery of a handwritten score that Eastman once delivered to R. Nemo Hill — a former lover, to whom the work was dedicated. In an interview, Ms. Leach energetically rattled off some of the peculiar requirements needed to perform this piece for 100 musicians: “three bassoons, three double-bass bassoons, two bass clarinets, three double-bass clarinets, three trombones, three tubas, six timpani.”

Explaining the score’s longtime absence from critical sight, she said, “I think it freaked Nemo out so much that it was just rolled up in a trunk.”