get BeatEdit at https://aescripts.com/beatedit-for-after-effects/
in depth version of this tutorial: https://youtu.be/9PDrPTM5kUg
music:
Paint the Sky by Hans Atom (c) copyright 2015 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/hansatom/50718 Ft: Miss Judged