During a key scene involving the Playboy mansion, a notable synthesizer/guitar track is played titled "Hold On", which is sung by Keta Bill.
This song however was never released, and still remains unreleased to this day. Instead, a different version sung by Corey Hart was released on the soundtrack.
One thing people might not notice is that both versions of the song can be heard in the movie. The Corey Hart version is indeed in the movie.
The Corey Hart version is heard faintly whilst the three lead characters are sitting in their car discussing their next move.
As to why the Corey Hart version was released and not the Keta Bill version remains a mystery.
The Corey Hart version is a slightly faster, more guitar driven version produced by Giorgio Moroder, whilst the other version is a more DX7 bass driven track along with its superior guitar solos.