I absolutely love to sync my music in film, video, games, etc. Much of my music has been composed with licensing in mind.
For all professional syncs (those with budgets and team members), please email Scott Cresto at Music Alternatives. They will be able to provide you with the necessary license.
If you have no budget or team, you are free to use a Creative Commons License. However, you must give attribution onscreen and in metadata. Use the atribution generator below.
Under CC BY license: http://cullah.com
Download full license: Creative Commons — Attribution 4.0 International — CC BY 4.0