Lisa Gerrard has long been a Michael Mann favourite for soundtrack composition. I haven’t myself seen it yet, but here is a trailer for a documentary made about Lisa Gerrard called, Sanctuary. It features various comments from artists including I believe Michael Mann. If you watch the YouTube clip of the trailer you will understand, if you don’t already, how Michael Mann’s films are made so evocatively using her unique vocal creativity.
Here are some other snippets to enjoy too!