Listen to Mozart: Sonata for Piano and Violin in B Flat Major, K.454 - 3. Allegretto online. Mozart: Sonata for Piano and Violin in B Flat Major, K.454 - 3. Allegretto is an English language song and is sung by Yu-Chien Tseng and Rohan De Silva. Mozart: Sonata for Piano and Violin in B Flat Major, K.454 - 3. Allegretto, from the album Reverie, was released in the year 2017. The duration of the song is 7:01. Download English songs online from JioSaavn.