Tried it once or twice, and the results are very hit or miss. "70s african funk without synthesizers" includes some stuff that matches the prompt, like Ofo the Black Company, but also includes more misses than hits: Herbie Hancock, War, Prince, the Ohio Players, and Sly & The Family Stone are all American. Seems like it latched onto "funk" and really went for it there. It's fun to give the bot a more vague prompt and see where it goes though.
Ultimately, my favorite musical "discoveries" have come from friend recommendations, or editorials like the Quietus or Bandcamp Daily. There's something about the social aspect of a personal recommendation that appeals to me, even if it's not as optimized as an algorithmic one. Many people don't have that sort of relationship with music though, so I could see something like this being pretty useful.