Did you ever consider the possibility that you simply met the wrong people? :P
Maybe I did, but... No offense... You're asking me to provide you images of a private eye so you can get ideas for what sort of detective music I'm looking for? Anyone who's ever seen a 1940's detective movie, or spoof would know what that music is like, and no photo of a private eye is going to help you get it right. That doesn't inspire confidence. :-)
Also the only screenshot I have is the art I posted in the graphics showcase here:
http://blitzmax.com/Community/posts.php?topic=79605
As you can see, that's not much of a help.
Anyway, the music would be something like a plucked bass with some saxophone and a bit of percussion and whatever else they use in that sort of music. Unfortunately I don't know where I could find samples of it, except maybe Who Framed Roger Rabbit. Guess I'll check youtube for clips of that and see what I can find as far as samples.