An interesting concept for a saxophone quartet piece is what Jason Freeman of Georgia Tech is presently working on. His new work, Flock, is set to be previewed this week.
"Working with programmers, a computer vision expert and an adventurous saxophone quartet, Freeman is creating a work in which a restless audience is very literally part of the music. Listeners and musicians are encouraged to wander around the performance space during the concert, while digital cameras track their motion."
Read the full article at Wired.com.
Freeman also has a site discussing his work: http://music.columbia.edu/~jason/flock/