Angel of Dusk for double bass, two pianos and percussion is a chamber music version of Einojuhani Rautavaara's double bass concerto dating from 1980. The work is dedicated to Olga Koussevitzky, the widow of Sergey Koussevitzky. The Koussevitzky foundation sent Einojuhani Rautavaara to study with Aaron Copland in Tanglewood, and it was Sibelius who chose Rautavaara as the recipient of this scholarship.