For 45 years, San Francisco’s Kronos Quartet has pursued a singular artistic vision, combining a spirit of fearless exploration with a commitment to continually reimagine the string quartet experience. The quartet returns to Transylvania on Jan. 28 for the 2020 Smith Concert after kicking off the yearly series in 2007. Tickets are free, but reservations will be required for the 7 p.m. performance in Haggin Auditorium.