Help fixing broken m4a files!

I think my header files are broken on approx. 3000 songs (.m4a).  I imported a bunch of songs into another program and pretty much an estimated 1 of every 3 files aren't working any longer...  Not sure how bad the damage is yet!   Any advice other than delete all the songs would be appreciated, since I purchased the majority of them and don't have the cd's for the rest anymore...

Hi Andyaubs,
Just in case you're still interested in repairing those .m4a files you could take a look at following post where "How to Fix Corrupt Audio Files" process is fully detailed.
http://aeroquartet.com/movierepair/corrupt-audio
Kind Regards,
Javier
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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