The Del Sol Quartet is a string quartet based in San Francisco, California that was founded in 1992 by violist Charlton Lee. Del Sol has commissioned and premiered thousands of works from a diverse range of international composers, including Terry Riley, Frederic Rzewski, Tania León, Mason Bates, Gabriela Lena Frank, Huang Ruo, Michael Harrison, Ben Johnston, Chinary Ung, Daniel Bernard Roumain, Kui Dong, Mohammed Fairouz, Theresa Wong, Erberk Eryilmaz, Ken Ueno, Peter Sculthorpe, Pamela Z, Reza Vali, Per Nørgård. As of 2023, quartet members are Benjamin Kreith (violin), Hyeyung Sol Yoon (violin), Charlton Lee (viola), and Kathryn Bates (cello). Hyeyung Sol Yoon, formerly of the Chiara String Quartet, succeeded violinist Samuel Weiser. Founding Founded in 1992, the Del Sol String Quartet began its life in residence at the Banff Centre for the Arts, followed by residency at San Francisco State University in association with the Alexander String Quartet. In 2002, Del Sol released its CD Tear. Del Sol was named winner of the Chamber Ensemble/Mixed Repertory category for 2005-2006 by Chamber Music America and ASCAP, and also received an ASCAP award for Adventurous Programming of Contemporary Music Other early appointments included the 2003 "Emerging Quartets and Composers Residency" with the Muir String Quartet and Joan Tower in Park City, Utah; Quartet-in-Residence at University of New Mexico; residencies at The Walden School and Tahoe Music Festival; and Northeastern University in 2007. Del Sol appears on programs presented by Other Minds, San Francisco Performances, Montalvo Arts Center and Santa Fe New Music/Santa Fe Opera. (from website) Interest in Just Intonation The quartet demonstrates a particular interest in string quartet writing in just intonation, particularly in the work of American composer Ben Johnston, along with composers such as Michael Harrison, Theresa Wong and Mathew Rosenblum. They are currently the only string quartet touring multiple quartets by Ben Johnston, which are notoriously difficult, and were the first group to premiere Johnston's music at the Library of Congress in Washington, D.C in 2016. In 2019, the quartet launched the "Pacific Pythagorean Music Festival", a music festival dedicated to works of just intonation. They were highlighted performers at the Pittsburgh "Beyond 2020: Microtonal Music Festival". They premiered "One-Footed" by composer Taylor Brook with the Partch Ensemble at REDCAT in 2022. Amplifying Asian Voices The Quartet's repertoire has always been chosen from the vantage point of San Francisco, looking across the Pacific Ocean, with a dedicated interest