Time was when a Boulez concert with the LSO would have been directed by the man himself, but that is no longer possible. In Peter Eötvös they have the next best thing, a conductor who has known the man and his music for decades, whose listening ear is scarcely less acute and whose most recent appearance wth the LSO, in Lachenmann and Brahms with Maurizio Pollini, made quite miraculous music from intensive rehearsal.

Visits by the New York Philharmonic Orchestra are always an adrenaline boost for musical life in London, and yesterday evening was no exception. The first concert in their brief residency took in Finnish, French and German music (plus one Russian piece – the big Swan Lake waltz for an encore), all presented with a distinctly American accent. This is an orchestra that trades in big sounds, delivered with clarity and confidence.

Russia isn’t the only country where violations of personal freedoms and censorship seem to be mounting by the day, but it’s surely the most confused: ask any of the persecutors what they hope to achieve, and you won’t get a convincing answer.

“I need to get a new gimmick.” Joyce DiDonato hobbled her way onto Milton Court’s stage last night, warning her audience to expect a seated performance owing to a sprained ankle. It was just six years ago she famously broke her leg during a performance of Rossini’s Il Barbiere at Covent Garden, but now, as then, she continued with no obvious dimming of intensity or focus.

Composer Tansy Davies and librettist Nick Drake’s opera Between Worlds cannot help but be a devastating tribute to the tragedy of 9/11. Yet the whole is peppered with problems that mean this result is achieved only intermittently. Davies – whose first opera this is – and the playwright Drake, with Deborah Warner directing, have picked a topic that would seem at first glance to demand the scale of a modern-day Götterdämmerung. The result they extrapolate is far from that – but when it does succeed, it is in ways that are not really about 9/11 at all.

Pierre Boulez sits in the back of a car as it drives across Westminster Bridge. He is talking about the audience appeal of his music, and he is characteristically direct. If the performance is good, and the situation is right, he insists, then audiences will come. That was back in 1968. The interview was featured in one of the documentaries that began today’s event, and it proved prescient. Boulez at 90, the day-long festival of music by the BBC Symphony Orchestra's former chief conductor, was well planned (by the BBCSO) and well performed.

Michael Tilson Thomas is in town to celebrate his 70^th birthday. And he's with old friends – he’s been working with the London Symphony since 1970, including six years as principal conductor. There is still plenty of chemistry here, and the orchestra’s strengths perfectly complement his, the clarity and boldness of his interpretations given voice in the orchestra’s precise ensemble and rich sonorities. The concert was a gala event with a retrospective feel, and each piece was well chosen to highlight an aspect of the long and fruitful relationship.

The Southbank Centre’s Women of the World Festival may have been the largest cultural event marking International Women’s Day 2015, but it wasn’t the most ambitious. Over at the Barbican two women were responsible for a multimedia opera staging whose spectacle, level of detail and sheer force of personnel involved was staggering.

Last year the London stage was treated to an electrifying Medea and an intelligent, refreshing Electra, at The National and the Old Vic respectively. Now it’s the turn of the Barbican to unleash the formidable force of Greek tragedy upon us, switching from Euripedes to Sophocles and a heroine who, compared to those others, is a pure-hearted innocent.

Having manoeuvred to get a new concert hall for London earmarked in principle, Sir Simon Rattle has finally agreed, as we thought he would, to take charge of the London Symphony Orchestra in 2017. By then, he'll by 62 (though I thought the big idea was to leave Berlin at 64, an appropriate benchmark for a Liverpudlian).