i know where you can find it, GoronMoron have what you want.
go on this topic (
Thread 39734) & request "[Game - Soundtrack] Crack Down (Genesis) Original Soundtrack" to GoronMoron,
this guy is sharing a lot of megadrive games, & crackdown is on MD (i don't know if it's the version wanted),
you have just to request this file to GoronMoron.
request him it, there is people before you in queue,
but i think it's the last chance to have what are you looking for.
regards :)
if this file is interresting you, sarah, you should have a look to this topic too ;)
really awesome