Critical Point for Cello and Live Interactive Computer Music and Animation. Roger Dannenberg, composer; Tomas Laurenzo, animation and software; Norbert Lewandowski, cello. Performed by the Pittsburgh New Music Ensemble at City Theatre, Pittsburgh, PA, USA. Kevin Noe, Music Director; Chris McGlumphy, Audio Recording; Andy Ostrowski, Lighting Designer. July 11, 2009.

Critical Point is written for solo cello and interactive computer music system with four-channel sound system. The computer records and transforms the cello sounds in various ways. The piece and the sound manipulations are completely composed, but since there is no prerecorded sound, the performer can play expressively, and the computer can adapt to the live performer. Essentially all of the sounds originate with the acoustic cello. At one section, the performer speaks or sings, and the vocal sounds are used to transform the cello sound into a speech-like vowel sounds.

The animation also responds directly to the cello sound and changes in predetermined ways according to a composed plan that is synchronized with the music. The animation is inspired by the work of Rob Fisher.

Critical Point is dedicated to the memory of Rob Fisher, a sculptor, media artist, and friend.

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