I never heard him play live, but fondly remember an impromptu concert given by Bill Dobbins, who was my Jazz History teacher at Eastman, in his honor shortly after he died in 1980. Dobbins, dressed in black, gave us an evening of Evans' tunes on solo piano.
Here is an interview done by his brother, Harry. In it he discusses many things; improvising, creativity, teaching, etc. Lots of great playing, too! The audio is in English, with Spanish subtitles.