Hello,
I'm sorry to hear you lost your MP3 download.
The Amazon MP3 store only delivers one copy of each Amazon MP3 file you purchase at the time of the transaction, and we are unable to replace any purchased files that you delete or lose due to a system or disk error. If you choose to download the file to your computer at the time of purchase, you are responsible for backing up the music stored on your computer.
However, because of the circumstances, I've made your music available for download again from Your Digital Orders.