Bracingly modern Agon was scored by Stravinsky with the brief that it be an 'enormous finale' without any foreplay. It's a high-energy reply - all crooked crescendos and spiky splinters of sound - and Balanchine is a mischievous puppeteer, urging his dancers through clever classical footwork and ugly, out-turned modern moves, physical theatre and gender-crossed roles. Male pas de quatres become coy and distinctly fey. Females take on the swagger and gait of men. And then, just as they're clawing back poise, he cuts strings entirely, leaving them to lope languidly around the stage.