In terms of album sales, the Beatles get the nod by a wide margin (259 million units).
The next four album sellers are considered solo artists (Elvis 207m, Michael Jackson 172m, Madonna 165m, and Elton John 161m).
Led Zeppelin and Pink Floyd take the 2nd and 3rd place respectively for rock bands, at 138m and 114m.
The Rolling Stones came rolling in behind AC/DC and Queen, however they did edge ABBA.
ADG