Listen to Divertimento No. 4 in B-Flat Major, K. 186: IV. Allegro online. Divertimento No. 4 in B-Flat Major, K. 186: IV. Allegro is an English language song and is sung by Ensemble Zefiro. Divertimento No. 4 in B-Flat Major, K. 186: IV. Allegro, from the album Mozart: Sérénades & Divertimento, was released in the year 2017. The duration of the song is 2:07. Download English songs online from JioSaavn.