Looking for some simple free music for your videos or YouTube look no further than the Google Audio Library:

https://www.youtube.com/audiolibrary/music

I am not going to tell you this is absolutely free and you can use it for anything you like, you need to make that call. However as of 2014 the site says:

The YouTube Audio Library is a collection of music tracks that are freely available for YouTube creators to download and feature as background music in their videos.

These high-quality 320kbps tracks are available royalty-free. Using them will not result in a claim on your video.

https://support.google.com/youtube/answer/4523596?hl=en

Its a great place to start looking. What I liked is it appears to allow you to use the music for videos other than ones you submit to YouTube.