At this time of year people who love ballet divide into two tribes: those who are too sophisticated for The Nutcracker and those who will never been too sophisticated for The Nutcracker. The former will say that The Nutcracker is a children’s ballet. For the latter, Christmas would not be Christmas without hearing probably the most familiar and adored of Tchaikovsky’s music scores.

THE choreographer George Balanchine died on April 30, 1983, aged 79, of Creutzfeldt-Jacob disease, a rare, if nowadays notorious, condition only discovered at his autopsy. What had been recognised long before his death, though, was that this man was one of the very greatest geniuses of the 20th century, a figure to be reckoned alongside Pablo Picasso in art and Igor Stravinsky in music.

Sir Frederick Ashton, Britain's unrivalled genius at creating ballets, had a simple attitude towards posterity. "You've heard his famous remark, 'Fuck posterity'?" says his nephew, Anthony Russell-Roberts, smiling but eyeing me apprehensively.