There's a little recorded choral partita by Scheidemann called Herr Christ der einig Gottes sohn. Leonhardt seems to have had a special penchant for it, because there are at least two recordings, one at the old church in Amsterdam, one at Marienhafe. In addition there is recording from Bernard Coudurier (I think a bit glib, but others may enjoy the simplicity. I enjoy the simplicity, but not when I've not Leonhardt ringing in my head! ) and one from Julia Brown on Naxos (to me the registrations sound unusual, but the performance is "deeply felt")
Leonhardt in Amsterdam benefits from the best organ - the best gravitas - and it inspires him to give a fabulous performance, one that convinces me that the music is a mini-masterpiece. Leonhardt's "deeply felt" like Julia Brown, but Leonhardt's deep feeling is less romantic, if you know what I mean. I think this is my favourite.
The organ in Marienhafe (Saxony) is less imposing, but is maybe a bit more interestingly astringent from the point of view of harmonies (I think that the Amsterdam church organ was equally tuned when Leonhardt made the recording.) The performance he gives there seems slightly more improvised, more flamboyant, more like a precursor of Stylus Fantasticus - it's interesting to hear the two together, to hear how the musician adapted to the instrument at his disposal.