Listen to Piano Concerto No.2 in B flat major, Op.83 4. Allegretto grazioso online. Piano Concerto No.2 in B flat major, Op.83 4. Allegretto grazioso is an English language song and is sung by Philharmonia Orchestra, Issay Dobrowen and Solomon. Piano Concerto No.2 in B flat major, Op.83 4. Allegretto grazioso, from the album Solomon: Greatest Piano Moments, was released in the year 2009. The duration of the song is 8:44. Download English songs online from JioSaavn.