About these Bach concertos

[persona]

I own a CD that contains 5 concertos by Bach (1062, 1060, 1065, 1059 and 1058). They are named "Concerto in X for 2 Harpsichords and Orchestra", and a couple of them "for 4 Harpsichords". The thing is, I've heard some of them with no harpsichord, named "Violin concerto" many times. I'm not sure which is the original version. But let me tell you, the harpsichords play a very leading part in these pieces. If they were added by some contemporary fellow, he sure knew what he was doing... So, does anyone know anything about this?

[astroboy]

i know that 1065 (i think) was originally for 2 harpsichords and then re-written by the composer for violin and oboe, or it might've been the other way around. im not sure.

[quantum]

Bach did reuse many of his themes, and incorporate them into several different pieces as well transcribe them for different instruments. 

Another example is the well known Arioso. 

[phil13]

Bach did reuse many of his themes, and incorporate them into several different pieces as well transcribe them for different instruments.

Another example is the well known Arioso.

Even that was used in the f-minor keyboard concerto.

Correct me if I'm wrong, but wasn't 1052 (the famous d-minor one) originally a violin concerto?

Phil