One problem I've run into with the music services is with older styles. For example, I'm specifically into black musicians from the 1930s-1950s who played swing style music. I have yet to find a service that actually will play more than 2-3 songs in that style before deciding that what I really want to hear is rat pack or swing by white musicians. No matter how much I thumbs down it, I get Glenn Miller/Frank Sinatra/…
You really need a level of manual curation that a big data statistical model just can't provided at scale.