'''''Brandenburg Concertos''''' by Johann Sebastian Bach (BWV 1046-1051, original title: '''''Six Concerts à plusieurs instruments''''')Johann Sebastian Bach's Werke, vol.19: Kammermusik, dritter band, Bach-Gesellschaft, Leipzig; ed. Wilhelm Rust, 1871 are a collection of six instrumental works presented by Bach to Christian Ludwig, Margrave of Brandenburg-Schwedt,MacDonogh, Giles. ''Frederick the Great: A Life in Deed and Letters''. St. Martin's Griffin. New York. 2001. ISBN 0-312-27266-9 in 1721 (though probably composed earlier). They are widely regarded as some of the best orchestral compositions of the Baroque era.