While Imma Be was a #1 smash single in the US, Rock That Body slayed Europe.

I don't know a lot of double exploitations that worked out correctly (Man Down/CKB, Rockstar 101/Te Amo for example).

Do you have other examples?

Nelly Furtado! Her singles from the Loose era were the first ones that came into mind. Such slayage back then.

I think I Am... Sasha Fierce singles did well too.

If I Were A Boy / Single Ladies?

I never knew it was.