Classical picks: San Francisco Symphony on Facebook Live; 'Ancient Echoes' at Penn Museum

Face(book)ing the Music. The San Francisco Symphony says it will become the first major symphony orchestra to stream on Facebook Live on Wednesday, when it performs the world premiere of Mason Bates' Auditorium. Pablo Heras-Casado conducts, with Bates performing on electronica - the piece samples the sounds of baroque instruments - at Davies Symphony Hall on Wednesday at 8:15 p.m. California (11:15 p.m. East Coast) time. Information: www.facebook.com/sfsymphony.

And while you're Facebooking your way around the classics, search for Kanye and Beethoven to hear the mashup created with the Los Angeles Young Musicians Foundation that comingles Kanye with the traditional symphony orchestra in a strangely compelling way.

- Peter Dobrin

Ancient Echoes. Rotundas are often problematic concert spaces due to their sumptuous acoustics, but at an 8 p.m. Tuesday concert titled Ancient Voices, composers Scott Ordway and Lembit Beecher will treat the Penn Museum's Chinese Rotunda as an opportunity to create works that might happen only there. Prompted by how well whispers carry in the space, Ordway has written Tonight We Tell the Secrets of the World for strings, soprano, and saxophone. Beecher's Limestone for four percussionists and solo cello suggests the carving noises involved in the creation of Tang Dynasty sculptures. University of Pennsylvania Museum of Archaeology and Anthropology, 3260 South St. Tickets: $12-$20. Information: 215-898-4000, ancientechoes.acfphiladelphia.org.

- David Patrick Stearns