These are the ones I have heard and recommend.
P.Bley, Open to Love
This is one of Bley's solo albums, and indeed it is a wonderful album. Bley was a hugely influencial pianist, and in the late 50s, 1958 he would creat a band that would become (minus him) Ornette Coleman's long time Quartet. He also recorded his debut album with Charles Mingus! This is to me one of Bley's best solo albums. It gets my star of approval.
Brand (Ibrahim), African Piano
King Ubu already has this, I think it is another fantastic solo piano album. The most interesting aspect is that it doesn't have the ECM sound. It was recorded by Japo production and it is suprisingly lo-fi for an ECM recording. I think even the piano is out of tune, but it is no matter to Dollar Brand. He uses african rhythm and melody in his one continous improvisation and the traditional western tuning system is largely irrelevant to what he plays on the album. This has been for a long time one of my favourite ECM albums. Essential!
Holland, COnference of the birds
This is my favourite Dave Holland recording. What more could you ask for, it features Anthony Braxton AND Sam Rivers!! It is beautiful, I especially like the flute playing. It is a fantastic album and highly recommended, with my star of approval
Jarrett, Facing you
I actually found this album on LP, it remains the only ECM recording I have on vinyl. (I am only 19 so I don't have too many LPs). I wouldn't give this my full seal of approval, but it is a pretty nice album. It was one of Jarrett's earlier solo recordings. So it gives an interesting prospective on what was to come.
Stanko, Balladyna
Tomasz Stanko is one of my favourite trumpeters, and I especially love his work with Kyzsztof Komeda. I actually havn't heard this cd, so I'm cheating. I just love Stanko's playing. It must be worth it just for him!
These I would like to hear maybe?
Paul Motian, COnception Vessel
Barre Philipps, Mountainscaspes
Surman, Upon Reflection
Waldron, Free at Last
Wheeler, Gnu High