Looking online, I found this discussion on Apple's forums and the consensus among these users is that Genius playlists stopped working for any song released after April 2010.
I tried the following songs that did not produce playlists:
- Come Together, Abbey Road, Beatles - Released on iTunes November 2010
- Perform This Way, Weird Al Yankovic - Released April 2011
- Black Sheep, Scott Pilgrim Vs the World, Metric - Released August 2010
- Bad Romance, Lady GaGa - Released October 2009
- Crossroads, 2NU, This is Ponderous - Sometime in the 90's
- CNR, Weird Al Yankovic - August 2009
From the Apple discussion previously referenced:
I called Apple Support about it and got escalated one step up the chain. The guy explained that genius works on a combination of local and global information, local being information from my computer, and it needs local information before it can make a playlist. I asked him if that meant that genius could work for someone else, but not for me, on the same song, and he said yes. He said I need to just keep playing the songs and updating genius. Well I bought the Arcade Fire and The National shortly after release and have played them close to 40 times each, and have now even made special playlists to try to train my iTunes to know what I think goes with these songs. I just can't believe there's not enough local or global information to make a genius playlist with these songs. It doesn't explain why a song used to work but no longer does. Plus the suggestion that I need local data before genius will work is not correct. I just bought Jailbird by Primal Scream (a 1994 release) and before playing it I updated genius. It then created a genius playlist just fine, despite it never having been played locally.Genius playlists are a good feature that need to be fixed.

3 comments:
Yes This issue is driving me kind of crazy. Did you find a solve?
http://spinthecat.blogspot.com/2011/07/itunes-genius-playlists-now-working-for.html
It appears to have eventually resolved itself.
I had the same problem - I had some old Genius mixes that I hadn't played in a while, so I deleted all the Genius mixes to start over. Updated Genius through the Store menu, several times. Majority of the songs that I previously had Genius mixes for, did not work when I tried them again.
One thing I did differently was that I had Unchecked all my selections, and on re-starting iTunes (to see if that would help with Genius) it had a pop-up stating that because all selections were unchecked, that playlists might not work, and songs might not synch to other devices.
So, that probably was what was messing with Genius, in my case. Hope that's helpful to others having the same problem.
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