Trio Mediæval returned in triumph to San Francisco on Sunday night. The Trio continues to produce hit recordings, and we are lucky that San Francisco Performances has had the wisdom to present them two years ago and again this year. In Herbst Theatre its program of religious music, grounded in 12th- and 13th-century Roman Catholic music, was expanded to include early nonliturgical music and new settings of ancient texts, as well as traditional Norwegian hymns.
