Listen to Piano Quartet No. 1 in C Minor, Op. 15: I. Allegro molto moderato online. Piano Quartet No. 1 in C Minor, Op. 15: I. Allegro molto moderato is an English language song and is sung by Mstislav Rostropovich, Emil Gilels, Leonid Kogan and Rudolf Barshai. Piano Quartet No. 1 in C Minor, Op. 15: I. Allegro molto moderato, from the album Young Slava, was released in the year 2017. The duration of the song is 8:17. Download English songs online from JioSaavn.