The League of Composers will present “Louis Karchin / A Retrospective” on Sept. 22, 2024 at Merkin Hall. The event features world premieres and works written between 2018-23 by Karchin, who has composed over 100 works. He is also a co-founder of the Harvard Group for New Music, the Chamber Players of the League-ISCM, and the Orchestra of the League {…}