Sales are sales. I don't care what decade it is. Adele is on track to selling 20 million, so null & void on that. The bottom line is that comparatively Gaga's sales don't match (and are below) where Madonna was at that point in her career. So, no, Gaga isn't at all comparable to where Madonna was. More people bought Madonna's music then people who buy Gaga's music now. Gaga is probably more like the fucking Spice Girls or something. Big for a few years, and then kaput.