Bach's second violin concerto is popular with violinists all over the world. The first movement sounds like it could have been written by Vivaldi, although it is longer and more complex than most Baroque concerto movements. The Adagio, in the unexpected key of C sharp minor, sounds like a improvisation in parts while the finale is a muscular dance in the rhythm of a Passepied. Here you can purchase and download the (transcribed) piano parts to play along to, recorded by a professional accompanist.