Listen to Rachmaninoff: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto online. Rachmaninoff: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto is an Unknown language song and is sung by Sviatoslav Richter, Warsaw National Philharmonic Orchestra and Stanislaw Wislocki. Rachmaninoff: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto, from the album 50 Piano Masterworks, was released in the year 2015. The duration of the song is 11:56. Download Unknown songs online from JioSaavn.