get BeatEdit at https://aescripts.com/beatedit-for-after-effects/
in depth version of this tutorial: https://youtu.be/62Qi0CF9UU8
music:
The Dream and the Dreamer by Elephant Funeral licensed under a Attribution License.
http://freemusicarchive.org/music/Caleb_Lemond/The_Learning_Curve/The_Dream_and_the_Dreamer
license: http://creativecommons.org/licenses/by/4.0/
