Using my music was a part of a voted contract. As well as using Fiverr. I confirmed every step with other developers before proceeding.
Here is the part of my contract.

"1 minute 30 second video
Script written by a professional writer from Fiverr (most of the cost)
Additional graphics from creativemarket.com
Adding voice recording
Video edition and music from my (bartekhl @slack) collection "

here is the link to the contract: https://docs.google.com/document/d/13OspN1gfxOTO1Ek-TtSOvpjowS3a-x4DnJTDODZ_t_w/edit