One top student orchestra playing on its own can be exciting enough. Two playing together can produce a charge of dynamite that might not leave the building standing. That was so anyway in last night’s Prom, when players from New York City’s Juilliard School and London’s Royal Academy of Music, by now frequent collaborators, joined up to shake the earth with thunderous brass, swooning strings, diamond precision, a velvet bloom – every characteristic of a world-class orchestra except the honour of being conducted by Lorin Maazel.

How silly an armchair looks in the Royal Albert Hall - like a rubber duck floating in the Pacific. Yet how right it was for those behind this excellent semi- staged Proms performance of Debussy's Pelléas et Mélisande to try to recreate a bit of fin-de-siècle intimacy for this most intensely intimate of operas. And how appropriate also for there to be a couch on stage in a work that is, and has always been, a psychoanalyst's dream.

“Let a woman in your life," roars Professor Henry Higgins, “and your serenity is through. She'll redecorate your home, from the cellar to the dome and then go on to the enthralling task of overhauling you.” It’s a scenario not unlike letting the winsome darling that is musical theatre loose among the club armchairs and smoking jackets of a classical music festival.

Two weeks to go to the Olympics, of course, but the Proms Olympics – 84 concerts in 60 days – have already taken off, with Britain placed first, second, third and fourth. For last night’s First Night concert was one where everything except Canadian singer Gerald Finley was British: the composers, the conductors (all four of them), the orchestra, certainly the weather.

Britten: War Requiem Netherlands Radio Philharmonic Orchestra, Netherlands Radio Choir, Netherlands Children’s Choir/Jaap van Zweden and Reinbert de Leeuw (Challenge)

It could have been a cow lowing in the distance, the sound drifting across a barren landscape. Its tone transformed after echoing through hillsides and ravines. Actually, it was Karl Seglem blowing into the horn of a goat. Suddenly, he stopped and began wordlessly chanting. The other two musicians on stage at St Luke's kept their heads down and continued providing the sonic wash knitting together this collaboration between the classical, jazz and uncategorisable.

Mozart: The Four Horn Concertos Marc Geujon, Orchestre Paul Kuentz/Paul Kuentz (Calliope)

By the time she went to college to study to become a singing teacher, Joyce DiDonato had been to exactly two different American states: Kansas and Colorado. New York and San Francisco were as yet unvisited, Europe and Asia as yet undreamed of. It’s a story DiDonato herself tells with practised humour. Jump forward 20 years and there isn’t a continent or metropolitan hub unconquered by this supreme mezzo-soprano, whose career may have taken her impossibly far from her Kansas beginnings, but whose sunny, unpretentious workmanship is still pure Midwest.

For the general public, getting to see the Mansion House in the City of London is almost as easy a task as becoming a dentist who specialises in hen’s teeth. But that was not the only reason for coming along to last night’s Orchestra of the Age of Enlightenment’s concert conducted by Edward Gardner. For this City of London Festival programme contained a most teasing prospect. Alina Ibragimova, the most questing and lively young violinist of our time, was actually going to play a repertoire concerto.

Standing ovations. Spontaneous genuflections. A we-can-change-the-world lecture. This must be what's it like to live in a Communist state. Funnily enough, the Simón Bolívar Youth Orchestra, who we were saying goodbye to last night in the final concert of their four-day Southbank residency, already do. I'm not a supporter of El Sistema, the body which gave birth to this youth orchestra.