Listen to Mozart: Clarinet Concerto in A Major, K. 622: 1. Allegro online. Mozart: Clarinet Concerto in A Major, K. 622: 1. Allegro is an Unknown language song and is sung by Gervase De Peyer, London Symphony Orchestra and Peter Maag. Mozart: Clarinet Concerto in A Major, K. 622: 1. Allegro, from the album Mozart in the Car, was released in the year 2021. The duration of the song is 13:07. Download Unknown songs online from JioSaavn.