I&#x27;d believe this if we had a music service today with a &quot;recommendation engine&quot; that was worth anything. IMHO it&#x27;s a complete crapshoot on all the ones I&#x27;ve used. I still think Pandora&#x27;s is &quot;best&quot; but that&#x27;s because it&#x27;s actually recommended music I haven&#x27;t heard. Most recommendations are of the form &quot;you liked song A from band Y - try song B from band Y&quot;.<p>As an aside - this feels like a &quot;submarine&quot; post (<a href="http:&#x2F;&#x2F;paulgraham.com&#x2F;submarine.html" rel="nofollow">http:&#x2F;&#x2F;paulgraham.com&#x2F;submarine.html</a>). I can&#x27;t tell what they are selling though.