the worst thing about this list is that the only 2 females in the list have literally the worst catalogue sales. Shows that the US music industry is dominated by a) males or male groups and b) by country music.
Garth's catalogue sales were that low in the past years because his catalogue is a) not on itunes and b) mostly out of print. This dude literally sells off whatever rest of shipment is still on shelves in the US. Otherwise, he would probably be closer to 80m albums sold or even 100m.