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Another impetus for his “Narcissus” is to dust off a neglected score, “Narcisse et Echo,” which Nikolai Tcherepnin composed in 1911 for “Narcisse,” a Ballets Russes work choreographed by Michel Fokine, with Nijinsky in the title role.

“Narcissus,” his new evening-length work at New York Live Arts — set to Nikolai Tcherepnin’s score for the 1911 Ballets Russes production “Narcisse” — looks at the familiar Greek myth from a queer, contemporary perspective.

Leong doesn’t quite know why he bought it, only that he was curious how the work might look in his apartment, with its sculpture of a miniature tank by Lutz Bacher mounted to seem as if it’s driving up the wall over the entrance to his bedroom, or Stefan Tcherepnin’s life-size Cookie Monster statue, which dominates the guest room.

In New York on May 24, Ms. Schroeder will play the piece again, this time with Stefan Tcherepnin, a former student of Amacher’s.

Mr. Tcherepnin said that he and Ms. Schroeder plan to linger in the concert space in the days before the concert, testing out resonances and picking out parts of the various “Petra” sketches that sound particularly exciting inside St. Peter’s.