Regardless of the GPL, I think this qualifies as fair use by any reasonable interpretation. By the I'll-take-down-your-youtube-video-because-my-copyrighted-musi

Regardless of the GPL, I think this qualifies as fair use by any reasonable interpretation. By the I'll-take-down-your-youtube-video-because-my-copyrighted-music-is-playing-on-the-radio-in-the-background or every-unauthorized-song-download-is-a-loss-of-$150,000 interpretation, I think the author should sue for seven or eight figures.