i prefer the opposite.
I like to try to capture the day in my footage and then express that feeling in the edit. So for me, song choice comes after shooting.
Think of it this way.
So say you come into a day of shooting and you've decided you want to give the day a dramatic feel because you've picked out this dramatic song for the edit. Now, you're done shooting for the day, and you've got all your dramatic footage, but you realize that for everyone participating in the day it was a really fun filled, happy going day. Wouldn't you say your footage wouldn't quite match the emotions of the day?
Keep in mind that my above feelings are applied to the world of skiing and event coverage of any sort.
However, if it's a set shoot where you've already thought out and storyboarded what you'll be shooting, then there is no problem with preselecting a song.