SAN FRANCISCO -- Yo-Yo Ma spent the better part of the pandemic playing cello to an online audience seeking solace in his music.On Friday, he marked his return to San Francisco by playing an energetic Bach cello suite before a live audience to inaugurate the opening of a new performance center designed to increase public access to classical and jazz music.Ma praised the top-notch acoustics in the San Francisco Conservatory of Music's Bowes Center for Performing Arts and the “safe space that