Gramophone: outstanding; Fono Forum: outstanding.
It is typical that whenever Bach dedicated himself assiduously to a long-existent musical form available in a variety of examples, he inevitably ended up adding a number of variants to it. Although he no doubt conceived his versions merely as evolutionary stages of the pre-existing form, posterity came to regard them as revolutionary. This is also the case with the six sonatas for violin and harpsichord.