see peertracks.com for an example of what you are describing. its launching march 2015. Users will buy songs in usd and the usd will be turned into noteUSD on

see peertracks.com for an example of what you are describing. its launching march 2015. Users will buy songs in usd and the usd will be turned into noteUSD on the blockchain. All song sales and streams etc will also be tracked on the blockchain. The frontend that interacts with consumers will be run traditionally through a private company etc.