"Moonsong (OST Version) - Cave Story" is a high quality rip of the OST version of "Moonsong" from Cave Story.
Jokes[]
The melody and chords have been changed to "Lucid Dreams".

A frame from the rip.
Instead of simply displaying the thumbnail image, the video displays the game's logo alongside a Cave Story sprite animation depicting the area the advertised track plays at, the Outer Wall, where Kazuma and a Sky Dragon are standing.