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We present REXband, an interactive music exhibit for collaborative improvisation to medieval music. This audio-only system consists of three digitally augmented medieval instrument replicas: the hurdy gurdy, harp, and frame drum. The instruments communicate with software that provides users with both musical support and feedback on their performance using a "virtual audience" set in a medieval tavern. REXband builds upon previous work in interactive music exhibits by incorporating aspects of e-learning to educate, in addition to interaction design patterns to entertain; care was also taken to ensure historic authenticity. Feedback from user testing in both controlled (laboratory) and public (museum) environments has been extremely positive. REXband is part of the Regensburg Experience, an exhibition scheduled to open in July 2007 to showcase the rich history of Regensburg, Germany.

We present iSymphony, an interactive orchestral conducting system for digital audio and video that adaptively adjusts to the user's conducting style. Using a digital baton, users may control the tempo, volume, and instrument emphasis of a digital audio and video recording of an orchestra. The system adaptively recognizes three gesture profiles: the four-beat neutrallegato pattern, an up-down pattern, and random gestures. The system uses an audio time-stretching algorithm we developed that allows the playback speed of a digital audio recording to be arbitrarily adjusted without changing its pitch. iSymphony is an example of how computers can enable more people to experience an interaction style normally limited to a few people (conductors), and is installed as part of the It's Artastic! exhibit at the Betty Brinn Children's Museum in Milwaukee, USA.