The Takacs Quartet has named a replacement for departing violist Roger Tapping, and the San Francisco Symphony can’t have been terribly happy to hear about it. The SFS’s beloved principal violist, Geraldine Walther, was tapped by the Takacs, and will leave the Bay Area later this year. Walther is widely considered to be one of the top orchestral and solo violists in the U.S., and will be joining a quartet which has had a great run of success in recent years.