Listen to Violin Sonata in B-Flat Major, K. 372: I. Allegro online. Violin Sonata in B-Flat Major, K. 372: I. Allegro is an English language song and is sung by Konzentration Musikexperten and Classical Study Music. Violin Sonata in B-Flat Major, K. 372: I. Allegro, from the album 15 Best Songs for Study – Easy Learning, Focus, Better Concentration, Einstein Effect, Mozart, Beethoven, was released in the year 2017. The duration of the song is 3:13. Download English songs online from JioSaavn.