I think there is not so much music in the pentatonic that is formed by the black keys, or a related scale. Off the top of my head only Paul Desmond's Take Five comes to my mind. I think this mainly because it is horrible to read and write in traditional notation.
Coincidentally I played a bit of Stevie Wonder's music recently which was all in E-flat minor. I have to say it is very pleasant to play, especially if you use Steve's often unusual fingerings.
Reading it OTOH was not so pleasant. This hints to me that our music is not only influenced by the way it sounds and the way it can be played but also by what is convenient to write down and read - and sometimes it takes a blind artist to overcome this limitations.