Bach penned two versions of a concerto for two soloists: 1043 for two violins in D minor and 1062 for 2 harpsichords in C minor. The transition likely is to accommodate the compass of the keyboard instruments.
It's believed the violin version preceded the one for two harpsichords. We listen to a variety of performances and settle on liking ones where the character between soloists is clear enough to differentiate the musical dialog taking place between the two solo parts.
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