If it's possible for any of the three permutations to return the full discography, then that would be the best way, wouldn't it? I can't see why anyone would just want a list of "ELO" releases - in fact, it might mislead them into thnking that's all there is on the site.

I could understand if there was something different about ELO and Electric Light Orchestra (in the same way that, say, Wings are distinct from Paul McCartney), but they are one and the same - just different ways of writing it.