�y��vlog

Morton Feldman’s score, “Ixion,” an environmental collage of chirping birds and distant thunder, evokes the sluggishness of a warm summer day.

The dog Cerberus relaxed his guard; the wheel of Ixion stood motionless; Sisiphus sat at rest upon his stone; Tantalus forgot his thirst; for the first time the faces of the dread goddesses, the Furies, were wet with tears.

Mr. Butterfield said that it is “the sort of infernal business that would make Sisyphus and Ixion smile kindly on the job satisfaction they got from their daily toil,” referring to figures from classical mythology forced to labor in pain for eternity.

With its natural sounds, the score, Morton Feldman’s “Ixion,” evokes a hazy summer day.

They called the concept of a rocket stage-turned-habitat Ixion, after the grandfather of the Centaurs.