Sonic the Hedgehog (commonly known as Sonic OVA) is a 1996 Original Animation Video animated by Pierrot that based on Sega's Sonic the Hedgehog series and was made around the series 5th anniversary.
There were plans for a soundtrack for the movie, but this never came to be due to failure performance.
In August 2020, a user in the Sonic fandom that goes by the name Illuminor got in contact with someone who had copies of the Production Demo Recording of the movie's soundtrack.