It might still be widely practiced today in the music industry, but years ago, in order to get press coverage and build a fan-base, Black musicians generally toured, and found widespread appreciation, music venues in Germany, Denmark and Norway (to name a few).
I found a West German documentary film about Jimmy Smith (circa 1965).
Excerpted from a reader's comment, on this video, I found out that:
"This tremendous documentary was directed by Klaus Wildenhahn, Ex-Chief of the documentary Dpt. of the NDR (North German Television) in Hamburg," (YouTube member: imaginatevos).
Upon further inspection, I found another comment about Jimmy Smith:
"Thanks for sharing such a great documentary about a great musical genius who played a significant role in the development of classical, traditional and contemporary JAZZ. Jimmy Smith will always be remembered for his outstanding contributions to JAZZ worldwide," (3 weeks ago, by: Gregory Eason).
I'm going to watch it, later on tonight, after supper.
PS/ There's no English translation or subtitles; the documentary is about 1 hour and 40 minutes; and includes interviews and concert footage. From what I can tell, it's mostly filmed in Black & White (noir).