SPAC’s executive director, Elizabeth Sobol, announced Aug. 16:

“As many have heard, Yo-Yo Ma was forced to cancel appearances at Tanglewood last weekend after testing positive for COVID-19. We learned this morning that he is still not well enough to perform.

Yo-Yo’s friend and collaborator, the incomparable pianist Emanuel Ax – who has not been to SPAC since 2015 – will join us tomorrow night in a performance of Mozart’s great Piano Concerto in G Major, K. 453, followed by the Prokofiev Symphony No. 5.”