I think that when we talk about Bitcoin, we should avoid word "official". There is no such thing like official Bitcoin website, official wallet and other stuff which can't be called official. Same thing about your offer to create official song for Bitcoin. Maybe idea isn't bad, but such stong still will be unofficial.
I'm trying to imagine how much it would cost to hire popular band and create song. Also, good music video would be needed too. And offcourse, everyone should get paid in Bitcoin
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The problem with that when you take a popular band is that they have then the copyrights for that , and this means you cant use it official as a Song for Bitcoin.
The Music industry and copyrights is really crazy , if there would be a song and it gets uploaded to the coming Youtube Channel for Bitcointalk it would be a problem.
If there will be something done like a Song it must be copyright free and the next thing is in what kind of Music style you would be going ?
Not everybody likes Rock , Rap , Trap , Rnb , Metall or Techno , just my 2 cents as i making now over 20 years and produce Music .
Lots of things there you have to think about it.