I'd like them to play with an orchestra, but only if they rearranged the songs around. Something like S&M wouldn't work... Metallica just played everything the same with orchestra playing something else in the background. IMO for an orchestra to work with Maiden's music, they'd have to rearrange the songs so that some vocal parts are done with choirs, some riffs/melodies with strings etc. Some songs like say, Paschendale, Empire, Journeyman, wouldn't need that, but they don't have enough of those for a full show.