The free software song by richard stallman.
This is a video even though it's rendered as a audio file. Open the file link in a new tab (middle mouse click, or right click > open in new tab) to watch the video.
https://ia801409.us.archive.org/21/items/gnu-v1.2-daniel_kelly/gnu-v1.2-daniel_kelly.webm
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v0.2.0-c793a28