Please don't ever make me choose between Schlippenbach or Cecil Taylor.
Taylor is kinda the ultimate point of reference for any sort of free piano playing. It's to the point where i feel lazy for making that comparison. It's conceivable that if you removed the bop and r&b influence that Taylor had and he grew up in Europe, then he would probably sound not all that dissimlar from this.
Educate me on free jazz pianists.