Found this one by accident this afternoon, thought I’d share.
Running Linux? Is there a song you like?

Google the song in Google Video; who cares what the homebrew video is, just go looking for good audio.
Pull the movie up in Firefox; when the movie finishes buffering, do :

ls -lh /tmp/Flash*

.. and copy the newest file somewhere else, say yer desktop. Now you have a copy of the video.

We just want the audio, so using ffmpeg (sudo apt-get install ffmpeg if you don’t have it), do:

ffmpeg -i [Flash File] [song name] .mp3

And that’s it; one MP3. Use your favourite id3 tool to add tags, and enjoy!