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http://www.guidemyjailbreak.com/get-jailbreaking-help-fast/post/1934546?lastPage=true
Here was my answer to him:
A little googling tells me that this is caused by upgrading your firmware, then restoring your info from backup, then jailbreaking. If you restore your phone from backup a second time now that the jailbreak is in place, the problem should be corrected.
http://absinthejailbreak.com/forum/fix-music-player-not-working-after-5-1-1-jailbreak/