"Waterfall - Contra" is a high quality rip of "Waterfall" from Contra.
Jokes[]
Starting at 0:09, a recurring riff has its melody slightly changed to sound like The Lick. At 0:19, the melody briefly changes to "At Doom's Gate" from Doom. Finally, at 0:32, the melody changes to "Theme of "Knuckles"" from Sonic the Hedgehog 3 & Knuckles. The rip then loops over at 0:41.