How much of the US market is made up of the music industry?

Does anyone know of a website that breaks down the US economy into what brings in the money? Specifically, how much does the music industry make up the US market?

Possibly the IRS or an Entertainment Guild could better direct you. You can contact your local IRS office or one of the Entertainment organizations at this site

http://www.afm.org/resources/labor-unions

Not the best answer–but a start