Choose a License
Figure out how to share your work back
The license you choose for your music video will depend on the music you chose in the very beginning.
You'll have to figure out what licenses are compatible with the license of the original music, since, as mentioned previously, "Under CC licenses, syncing music in timed-relation with a moving image is always considered an adaptation."
CC's FAQ, If I derive or adapt a work offered under a Creative Commons license, which CC license can I apply to the resulting work?, may help you with figuring that out.
Then you can play around with CC's license chooser tool to see what the different options look like.