You’ve got to have a gimmick! It’s not all they do, but the conductor Nicholas Collon and the Aurora Orchestra have carved out a niche all their own playing whole symphonies of Beethoven, Brahms, Shostakovich, and Berlioz by heart. Who else does such a thing?! No one. You’d best believe audiences go bananas. For their latest high-wire act, they’ve chosen Stravinsky’s dazzling Firebird Suite. —M.G.