Spotify is definitely not trying very hard, the author is justified in complaining. I had a very similar experience. They are in a perfect position to be able to make something amazing, but they (and other streaming companies) are somewhat limited in what they can do because of their music licensing relationships. I was able to build something 100x better than their DJ using an off-the-shelf LLM and some well-crafted search/metadata tools. It has no problem doing what Petzold wanted. It's a much better way to interact with music than what the general public has access to now, and I would love to commercialize it, but the rights-holders (UMG, WMG, Sony, etc) are very protective of what they own. If you want to know more reply here or reach out to me at [email protected].