Prince Yeletsky, one of the shortest roles for a principal baritone in opera but with the loveliest of arias, looms large in Stefan Herheim's concept of The Queen of Spades.

Diversity, and the need for more of it, is a hot potato in the theatre arts. Kudos, then, to English National Ballet and its director Tamara Rojo for the 23 nationalities represented within its ranks. And for the poster advertising the company’s current revival of Swan Lake which pictures African-American first artist Precious Adams in swan queen pose. But hold the applause for a moment.

The Matthew Bourne Swan Lake has become a classic. And – lest that word conjure up dusty tomes and a niggling sense of obligation – this is definitively not the old-but-worthy, improving-but-dull kind of classic.

Once a year is never too often to revisit one of the most perfect of all orchestral scores (not just for the ballet), a climactic Russian Imperial Pas de deux and the old-fashioned magic of illusionist painted flats flying in and out across a production/choreography that manages to crack the soft nut of a fantastical story only a quarter told. It all adds up in Peter Wright's Royal Ballet Nutcracker.

Forget the latest International Tchaikovsky Competition winner (I almost have; only a dim memory of Dmitry Masleev's playing the notes in the obligatory First Piano Concerto, and nothing else, remains from an Istanbul performance). Had Pavel Kolesnikov been competing and given a performance like the one he did last night, there'd have been a riot had he not won.

Latvia is fighting fit. The recent elections did not see the expected victory for the pro-Kremlin Harmony party; support for the European Union and NATO will be well represented. Last week the feisty Lavtian Ambassador to the UK, Baiba Braže, landed a perfectly diplomatic punch on the smug mug of our latest apology for a Foreign Secretary, taking former Remainer Hunt to task for his outrageous parallels between the EU and the Soviet gulag by reminding him how Latvia had suffered under the USSR and how eagerly it has adopted the best European values.

Sometimes the more modestly scaled Proms work best in the Albert Hall. Not that there was anything but vast ambition and electrifying communication from soprano Anna Prohaska and the 17-piece Il Giardino Armonico under Giovanni Antonini, making that 18 when he chose to take up various pipes (★★★★★). By contrast the big BBC commission from Joby Talbot to write a work for much-touted guitarist Miloš Karadaglić and orchestra in the evening's first Prom left very little impression.

When Tamara Rojo won the top job at English National Ballet in 2012, it looked like a poisoned chalice. Directors had come and gone, some of them with visionary ideas, but all were defeated by the company’s peculiar position as underdog to the company at Covent Garden.

A new Swan Lake at the Royal Ballet is a once-in-a-generation event.

The BBC Young Musician final was a big event in Birmingham. It drew a capacity audience to Symphony Hall, as enthusiastic, engaged and encouraging as any of the competitors could have wished. After the prodigious talent on show in the section finals, it was no surprise that the standards here were sky high. Fortunately, the three finalist were also born entertainers, making for an enjoyable, though excruciatingly hard to call, competition.