Bach Recording Recommendations

I second the recommendation of Grumiaux (violin).

I also agree that Pinnock (keyboard) is usually wonderful.

All of them!   (And I don't consider myself necessarily a Bach-enthusiast.)

I can't think of a single Bach recording I haven't liked.  That's just the nature of the music.  (Although I confess, I no longer listen to some of the turgidly Teutonic or "do it for England" recordings popular before the 'original instrument' craze blew them away.)

For the Brandenburg Concertos I'd recommend the Dunedin Consort on a Linn Records SACD.  Great performance and great sound.

+1 for the Brandenburgs with the Dunedin Consort.