When you are preparing a new project (doesn’t matter if it is a game, a video, a presentation or a new home audio system), it is always good to have access to some music to use as background.
One good way of having music in your projects is by using music with creative commons license, and one good way of getting access to that music is through digccmixter.
How it works? Simply look for the type of music you need, check the type of license associated with it, download it and use it (give proper credit to authors if required).
These are the types of licenses they use in their files.
As an example, I downloaded this song:
I dunno by grapes (c) 2008 Licensed under a Creative Commons Attribution (3.0) license. http://ccmixter.org/files/grapes/16626 Ft: J Lang, Morusque
Then using media.io an MP3 online file type converter, I turned into WAV format.
Because I didn’t have any project or video at the moment, I simply created a video with my Matlab script to make spectrogram videos out of WAV files.
The final result is quite good, and notice of course that I acknowledge the music authors in the video description.