The Information Is Beautiful web site has a wonderful info-graphic of how much artists really earn online. Click that link to see the whole thing. You may be very surprised at what you learn.
From Information Is Beautiful: "Recently, the UK government passed The Digital Economy Act which included many, perhaps draconian, measures to combat online music piracy (including withdrawing broadband access for persistent pirates). Much was proclaimed about how these new laws would protect musicians and artists revenue and livelihoods.
But how much money do musicians really get paid in this new digital marketplace?"