AlexB -- I remember seeing a TV interview with the members of ABBA back in the late '70s or early '80s; it was on the American Sunday-evening news program 60 Minutes, and described ABBA as "Sweden's #2 export" (after the Volvo!).

Anyway, Bjorn and Benny spoke English quite well, but the two girls were definitely much less fluent and seemed uncomfortable with English -- and they gave very very short answers.