The San Francisco-Shanghai Sister City Committee wanted its cultural delegates to spread out a bit into the community.  We thought our best contribution would be to go and work with some choirs.  We went this morning to Shanghai Normal University where choir director Wang Jin greeted us.  Four choral groups sang for us, starting with the Xinsgshi women's chorus and continuing with three small a cappella groups.  They invited our comments, and we gave them - mostly about performance style.  After this vigorous session, observed by many members of the university's music department, we were invited to a really really delicious lunch of Shanghai specialties.