Super Riff Bros. 3 is a Super Mario Bros. 3 hack created by Freakin HA, inspired by Kaizo hacks such as Kaizo Mario Bros. 3, Kamikaze Bros. 3, the Kaizo Mario World trilogy, etc.
This TAS races through the hack in less than 20 minutes in time to save Peach, only to find that she's a whiz at 1970s music.