Turbo Out Run
The intro music in the C64 version was originally written for Outrun Europe, an Outrun sequel developed by Probe, which was shelved when the deal to convert Turbo Outrun form the arcades was agreed. After Turbo was released, Outrun Europe was deemed not to be good enough to release, and recoded from scratch, ultimately released as Outrun Europa.
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Trivia contributed by Martin Smith.