This was the first dance whose choreography Cunningham developed in part with the use of an early model of the computer software Life Forms. The title comes from a button on the software called “Track.” Cunningham himself was in the piece: at one point he reentered carrying a portable barre such as he used in the studio, which he then used as an aid in performing some of his movements. The other dancers continued without reference to him. The music, Gravitational Sounds, was an electronic composition by Emanuel Dimas de Melo Pimenta. The barre was the most prominent feature of Dove Bradshaw’s design; the men wore shirts and tights, while the women’s costumes mostly came from thrift shops.