Spotify has this currently. It’s an AI DJ that will introduce blocks of music similar to what you’d expect from a radio DJ. I don’t think it’s too popular, but I actually kind of like it. It’s definitely more interesting to listen to than just putting on a playlist - it pulls in music you’ve liked / favorited and plays genre-centric or themed blocks, and sometimes tosses in new stuff that Spotify thinks you might like. You can freely skip tracks, and if you skip a few in a row it’ll take the hint and move onto something else.