Lazyweb: full list of Sony BMG owned domains?

A non-spam comment recently arrived on the old Boycott Sony site, which is something of a rarity these days. Reader PJ asks whether there is a known list of sites that are owned by Sony BMG, or Sony generally, so that he can block those sites for showing up in AdSense ads.

I don’t have such a list. Does anyone out there? I suspect that part of the issue may be that Sony Music/Sony BMG registers unique domains for its artists, meaning that blocking ads for them may turn into a game of whack-a-mole. But I’ll throw the question out to LazyWeb anyway.