How to actually get the song:
http://blog.ujomusic.com/2015/09/get-ether/
The biggest problem with bitcoin is getting "normal" people to acquire even small amounts without going thru too many hoops, Coinbase and Circle are doing a good job there
I think this would be a lot clearer if you split this up into three guides: "How to buy bitcoin", "How to buy ether" and "How to buy the product".
EDIT: Also, the TLS certificate for alpha.ujomusic.com does not validate in firefox for me, as the certificate chain is not correctly installed on the server.
The only steps I want to go through are
1) Register an account (email/password)
2) Choose amount of bitcoin and destination
3) Pay