San Diego’s Mainly Mozart Festival is celebrating its 25th anniversary this season by inaugurating new series and expanding the concept of what a music festival can do. At La Jolla’s TSRI Auditorium, the festival presented a pair of stimulating lectures in its new Mozart and the Mind series and offered a stirring concert by the St. Lawrence String Quartet.

Time travel is usually the province of science fiction, but Ruben Valenzuela and his excellent period music cohorts of the BachCollegium San Diego took his La Jolla audience to 17th-century Venice with his Marian Vespers concert.