Jacques Dieval was a good-humored pianist with fair technique and somehow limited imagination.
A video of Dieval with Woody Shaw, Nathan Davis, Jacques B. Hess on bass and Franco Manzecchi on drums in 1965
http://www.ina.fr/art-et-culture/musique/video/I09282965/nathan-davis-woody-shaw-et-jack-dieval-en-studio.fr.html