For someone starting out in the world of film, what is the best way to get/handle/process rights to music for a film?

For example, I do all of my creative thinking as montages to a particular song that inspires me, and extrapolate from there, so many of my scenes are cut to match the music of a specific song.

>>>Shareholders will eventually get upset with all the money being pissed away.

So it should have been named the Xbox Wii?
I think the shareholders will agree...