I have selected for you two of the slow movements from two of the violin concertos of Joseph Boulogne, Chevalier de Saint George (see http://en.wikipedia.org/wiki/Chevalier_de_Saint-George).
The first is the Andante moderato from the Violin Concerto in C major, Op. 5, No, 1:
The second is the Largo from the Violin Concerto in G major, Op. 8:
I hope you enjoy this music as much as I do. A nearly forgotten composer who deserves to be discovered.
Related article: https://asifoscope.org/2013/02/07/black-music/