In his first Chicago performance since 1975, David Behrman returns in a concert with cellist Fred Lonberg-Holm. Together, they perform a new version of QS/RL. In the piece, computer software is linked to a synthesizer, pitch sensor and microphone. The software listens to the cello and responds to changes in the loudness of sustaining sounds within low and high registers. Behrman also performs his Homemade Synthesizer Music with Sliding Pitches. In this 2003 revival of the 1973 original, the synths are now virtual, controlled with a drawing tablet and videocam software.

David Behrman (b.1937, Salzburg, Austria) has been active as a composer and artist since the 1960s and has created many works for performance as well as sound installations. Most of his music has involved homemade electronics and computer-controlled music systems that operate interactively with collaborating performers.

In 1966, he founded the Sonic Arts Union with Robert Ashley, Alvin Lucier and Gordon Mumma. Working at Columbia Records in the late 60s, he produced the Music of Our Time series of new music recordings, which presented works by Cage, Oliveros, Lucier, Reich, Riley, Pousseur and other influential composers. From 1970-76 he worked as a composer/performer for the Merce Cunningham Dance Company and was commissioned to write several pieces. He received a D.A.A.D. fellowship in 1988-89 and an Individuals Grant from the Foundation for Contemporary Performance Arts in 1994. Behrman lives in New York.