The second of five movements of a "Sinfonia concertante" in an expressionist / late romantic idiom for string orchestra. A somber, tenebrous fantasy on the Lutheran chorale "Aus tiefer Not schrei ich zu dir" ("From deep affliction I cry out to you"), a paraphrase of Psalm 130, ultimately resolving itself into a heroic statement of the incipit of the chorale "Jesu, meine Freude" ("Jesus, my joy").
You may find the engraved "conductor's score" here.
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