"Final Boss (Beta Mix) - Sonic the Hedgehog 3 & Knuckles" is a high quality rip of the beta mix of "Final Boss" from Sonic the Hedgehog 3 & Knuckles.
The rip begins with the song "Takeover" from the Friday Night Funkin' mod VS Cassandra (Alpha Release). At 0:09, the rip transitions into the advertised track, but with the melody and chords changed to "Takeover". At 0:31, the advertised track's melody returns to normal, but with Cassandra and Boyfriend's voices singing along. At 0:40, the melody changes to "Dad Battle" from Friday Night Funkin'.
The rip loops from the 0:09 mark at 0:52.