With the previous Vine you were not able to use your music if you use Apple Music Plan. It would be the world to many if in V2 you are able to do so.
Don’t quote my on this, but I think because the videos will only be 6 seconds long all music can be used (due to fairplay acts). However, if a takedown notice happens V2 will have to take action.
I hope so because. All my music comes from the Apple Music subscription.