It was about 20 years ago when I was at a weekend jazz event in California.Rein De Graaf was attending the event as a listener, but not scheduled to perform. My good friend (the late) George Ziskind ,a fine jazz pianist ,located a room with a piano and wanted to play a bit just to keep his chops in shape. As he began to play in this mostly empty room, Rein De Graaff walked in and asked if he could also play. So for about one hour George and Rein alternated at the piano, each playing 2 tunes each time around. It was a reat treat for me to have the opportunity to hear two very good jazz pianists.
They both enjoyed it so much, that they agreed to do it again the next morning. So this was a second morning that I had a wonderful listening experience.
Rein De Graaf is very much a BEBOP oriented musician. He played many tunes those 2 morning out of the "bebop" playbook. Tunes by Bird, Monk, Tadd and others.