The downside being that the duplicate detection is nonexistent - I have a playlist I sync to my phone, and often when I&#x27;m listening on &quot;I&#x27;m Feeling Lucky&quot; mode at my PC a song will come up that I like and I&#x27;ll add it to the playlist. As you can imagine, this often leads to multiple versions of the same song taking up valuable space. The same goes for thumbs-up and thumbs-down - it won&#x27;t apply to all versions of a song. Which is fair enough when they&#x27;re actually different (live, remastered, remixed or whatever) but when we&#x27;re talking about the European release, NA release and Japan release of the same album it&#x27;s often literally exactly the same recording.<p>Trouble is, I can&#x27;t come up with a &quot;best of both worlds&quot; fix that allows both (perfectly valid) use cases.