Where do you get free mp3?

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I was searching for a place to download free songs. Actually, I needed just one song for a music lesson I am going to have next week. I went to the stores but they didn't have it. I searched over the internet until I found the song. It was weird because now it seams so simple. I went to http://www.getamp3.com What about you? Where do you go when you need a song that is not anywhere?