The sooner artists start thinking of digital copies of their music as advertising for their talents rather than the product itself, the better.
Performers apparently get about 13% of the selling price of CDs, so it's probably not a huge source of income for any but the biggest sellers.
The record companies, on the other hand, take 30% of the gross selling price. I therefore suspect that the artists who want compensation aren't the performing artists, but the piss-artists and con-artists of the recording indistry.
Source: BBC News