When an editorial formula proves to be as compelling as in the case of the E-major Concerto BWV 1042, then its obvious that it is going to be applied again: this time to Klaus Hofmanns new Urtext edition of the A-minor Concerto. Bachs manuscript leaves several questions unanswered. The slurring, particularly in the solo part, is once again equivocal and inconsistent.

Bach himself expected his performers to be creative, which is why the interpretative suggestions of Baroque expert Sigiswald K...