Why isn't the missing flashback music of bourne identity on it's soundtrack?

The missing flashback music from "The Bourne Identity" is not included on its soundtrack likely due to licensing issues or the decision to focus on more prominent and commercially viable pieces. Additionally, the score may have been composed specifically for the film's context, making it less suitable for standalone listening. Soundtrack albums often prioritize tracks that resonate with broader audiences or are integral to key moments in the film.