If you ever downloaded music from Walmart you better watch out. If it's not an MP3 your ability to listen will be gone when their Digital Rights Management server is closed on October 9. They join Google, MSN, and Yahoo who previously ended DRM offers.
The only way to save the music, albeit at a lower quality, is to burn it to CD then rip it back to your computer. Walmart's original promotion for its DRM music was "Microsoft’s PlaysForSure," obviously an outdated promise.
Any money you may have spent is long gone as no credits or refunds have been announced, repeating the error of other big time e-tailers.