Experience the Danish String Quartet’s Doppelgänger project, a daring initiative in which composers create new works, co-commissioned by Carnegie Hall, in response to a masterwork by Schubert. The Austrian composer’s String Quartet in D Minor is a powerful meditation on death and takes its name from its second-movement set of variations on his song “Death and the Maiden.” Finnish composer Lotta Wennäkoski, praised for her mastery of color and musical textures, adds her unique compositional voice to this fascinating project.