First, Mantic59 is correct about the music copyright. If you don't have a license or permission, you shouldn't use it, and shouldn't use the music on YouTube. For example, some musicians like Prince have law firms scanning the internet and suing anyone using their music.
Second - I would go some where, like Digital Juice, and test drive some of their music to find music that will fit your movie. It will cost you a few bucks to buy a license but it comes with very few restrictions.
Third - You can give your video to the company with a written permission to use the material but you retain the copyright. You need to ask the company who is their audience, how will it be shown, etc. For example, if it will be shown at a conference with several hundred people over a 3-day period, I would charge them a couple hundred dollars - I did this for Time Warner Cable for a regional conference. If the company wants to use it for broader and multiple distribution to their customers, I would charge more.