The Penn Museum’s Chinese Rotunda with its 90-foot-high walls topped by a self-supporting dome serves as a grand location for this 2017 Fringe Festival offering. ‘a disruption’ is a 50-minute musical performance of swirling, sputtering percussive dissonance. The latest composition by John Patrick Stewart, it was written for three cellists, four pianists, and four percussionists. The piece is performed in-the-round placing the audience in the center of the radially distributed musicians. Tickets are $20, available via the 2017 Fringe Festival website: fringearts.com/event/a-disruption/.