The greatest piano solo I've heard was from Don Pullen. It was the Charles Mingus memorial concert at Carnegie Hall in 1979. Pullen's solo on "Sue Changes" goes above what a normal human being can physical do on a piano. He must have been so emotionally overcome from Mingus' death that he temporally possessed super human skills. It is sort of like a mother getting the strength to lift a car when her child is pinned under the wheel. Although this concert was never released I did manage to get a copy of this.