The conductions of Butch Morris are an interesting later development within "Third Stream".  Wadada Leo Smith has contributed greatly also, start with Ten Freedom Summers.

Robert Schumann - String Quartets Nos. 1, 2, 3

Yes. Mike, I had seen that. But thanks for bringing it up again. I had had relatively high hopes when I first saw it, but they were dampened fairly quickly. At least half of its contents are well present on the reissue market, either on Metronome itself or on Dragon, or in the series mentioned by Jazzbo (of which I have parts 1 to 8 as well  ). Particularly little new in the reissue field of Gullin, Hallberg, Domnérus, Theselius and Ericson there. And very litle at all by the likes of Simon Brehm, Reinhold Svensson, Carl-Henrik Norin a.o. As if it was wellnigh impossible for any compiler to look beyond the obvious items for artists like these, for fear of not rounding enough sales. But hey, you reissuers, you are not so much going to sell compilations like these off the beaten tracks to the newbies wanting to expand into this area for the first time but to a not so small degree to seasoned collectors who already have most of the previous reissues and are looking to fil their gaps! Seems like reissues in niche fields of jazz that went out of their way not to duplicate previous reissues but specifically tried to fill gaps died out with the compilers of oldtime jazz or early blues.   When did you all last see a reissue that specifically stated on its back cover something like "Additional recordings found on ... No duplications between these!" ?  Yes I know - demands like these should not (necessarily) be adressed to Fresh Sounds!  (Though they did dare to cover their share of ultra-obscure 50s jazz (U.S., though ...) ).