Although they are often discussed, recorded, and published as a collection, the 6 concertos encompassing the so-called Brandenburg Concertos were not written all at once, nor for the same ensemble.
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Bach later put the 6 concertos together and dedicated them to the margrave of Brandenburg, hoping to get a new job out of it. Beyond that, they have nothing in common, and, in fact, among the 6, there is as much variety as you can find in any six works by Bach. Brandenburg Concerto No. 2 in F major might be the most popular of the 6 for its brilliant scoring. This is an example of a common orchestral genre of the Baroque known as the concerto grosso . A concerto grosso utilizes two ensembles, one large and one small.