Rog - Limahl could also get a gig via his band Kajagoogoo .... "I'm too shy- shy, hush-hush ..."
Anyway, the biggest selling "pop" artists (reputedly) according to Wikipedia:
(edited out what I think are not pop)
> 500m records sold1 The Beatles
2 Michael Jackson
200m - 499m records sold3 ABBA
4 Celine Dion
5 Cher
6 Cliff Richard
7 Elton John
8 Madonna
9 Rod Stewart
10 The Rolling Stones
In the 100m-199m sold list we get the likes of Backstreet Boys, Bee-Gees, Billy Joel, Bon Jovi, The Carpenters, Chicago, Dire Straits, Eagles, Fleetwood Mac, Genesis, George Michael, Prince, Queen, U2, Village People