The Brandenburg Concerto No. 3 of Johann Sebastian Bach, performed by the Swiss Baroque Soloists, is featured on CD 1 in the WRTI 60th Anniversary Classical 3-CD set.
The six instrumental works presented by Bach to Christian Ludwig, Margrave of Brandenburg-Schwedt in 1721 are among the finest musical compositions of the Baroque era. The Third in the set is scored for three violins, three violas, three cellos, and basso continuo, including harpsichord. The Margrave not only never paid Bach for his work, but he failed even to thank him. This third concerto is a highlight of one of the happiest and most productive periods in Bach's life.
Even though he didn't call them the "Brandenburgs" himself, Bach still thought of them as a set. Compiled from short instrumental sinfonias and concerto movements he had already written, Bach re-worked the old music, often re-writing and elaborating where he saw fit, and creating in the process some of the most brilliant and enjoyable of any of his works.