Continuing...
Some folks in the video community recommend something like SonicFire Pro (yes yes, I hear you in the back there,
Blasphemy!). It's a neat little tool to add background music, real easy to use. Personally, though, buying song's at $150 - $200 is a pop a better deal. You can slice and dice the music yourself as well as SonicFire does, plus you're buying the exact tune you want. Those SonicFire tunes, though loopable in a thousand way, are just too short in length - and the libraries are $200 a pop too - too much, IMO, for a too short, one timer.