Once you download an MP3, you should protect it as you'd protect anything else you purchased instead of expecting that it would be available to re-download indefinitely.
Oh, my bad, it was from iTunes from ten years ago, not Amazon. I found the support email. (I still have the mp3s)
"""
Thank you for contacting iTunes Store Support!
My name is Dianne, and I'm sorry to hear that you have been unable to redownload the album "Rachmaninov: Complete Piano Concertos", on your new computer. I can certainly understand how this could be disappointing for you, please be assured that I'm happy to help.
Unfortunately, this item is no longer in the iTunes Store, and only items that are currently available can be redownloaded.
If the content provider no longer offers these purchases on the iTunes Store, App Store, or iBookstore, your content will not be available for you to download again.
However, if you still have this album on the original computer, you can certainly transfer it to you new computer. You can do this in several ways. See the following article for how to transfer iTunes Store purchases using Home Sharing, an external drive, an iOS device (iPhone, iPad, or iPod), the Windows Migration Assistant, and CDs/DVDs:
"""
""" Thank you for contacting iTunes Store Support!
My name is Dianne, and I'm sorry to hear that you have been unable to redownload the album "Rachmaninov: Complete Piano Concertos", on your new computer. I can certainly understand how this could be disappointing for you, please be assured that I'm happy to help.
Unfortunately, this item is no longer in the iTunes Store, and only items that are currently available can be redownloaded.
If the content provider no longer offers these purchases on the iTunes Store, App Store, or iBookstore, your content will not be available for you to download again.
However, if you still have this album on the original computer, you can certainly transfer it to you new computer. You can do this in several ways. See the following article for how to transfer iTunes Store purchases using Home Sharing, an external drive, an iOS device (iPhone, iPad, or iPod), the Windows Migration Assistant, and CDs/DVDs: """