Bob Ostertag, the musician who committed "professional suicide" by posting MP3s of his music online a few months ago, has released a nearly hour-long composition called w00t, comprised entirely of audio captured from various classic videogames, under the Creative Commons Attribution 3.0 license. You can get the liner notes here; the audio downloads are below.
According to Ostertag,
The w00t "trailer" (audio preview -- 4.0MB, 4:14 minutes)
w00t (full composition -- 57.5MB, 50:15 minutes)