Have you tried Freegal? You get free, legal music downloads from artists on the Sony label, that’s thousands of songs!!!
It’s not a temporary download, it’s an MP3 file and you keep it! There is no software to download, just the song itself. Every library card holder can download up to five songs per week. To help you choose, you can listen to 30 second samples and if you’ve used up your downloads for the week you can create a wish list for next time. It’s like iTunes for the library, but free!