Hey Ian!

TAXI's a good move, but I'd stay clear of Broadjam.

Another option is to submit your music to music libraries directly, especially since you're interested in instrumental film/ad/music library stuff.

Good place to start is here: http://musiclibraryreport.com/ They have a list of over 200 libraries and feedback from writers that use those libraries. The site used to be free, but now I think they charge to be a member. You could sign-up for two weeks (minimal charge). That would give you enough time to compile a list of libraries that suit you and your music. The owner of the site, Art Munson, is one of the good guys.

You have some great tracks that would be perfect for underscores.

Good luck, John smile