Listen to Bassoon Concerto in B-Flat Major, RV 501: I. Largo - Andante molto online. Bassoon Concerto in B-Flat Major, RV 501: I. Largo - Andante molto is an Instrumental language song and is sung by Leningrad Chamber Orchestra. Bassoon Concerto in B-Flat Major, RV 501: I. Largo - Andante molto, from the album Antonio Vivaldi: 7 Concertos for Wind Instruments, was released in the year 1971. The duration of the song is 2:14. Download Instrumental songs online from JioSaavn.