We’ve all seen singers go wrong. Forgetting words, missing entries, skipping verses – it happens often enough, and is generally cause for little more than some awkward laughter and a second attempt. Never, however, have I seen a wrong entry (as ill-luck would decree, in the only sacred work of the programme) greeted with a resonant expostulation of “Oh, shit” from the performer, followed by minor audience uproar and many apologies. It wasn’t the finest moment of the evening for Juan Diego Flórez, but – loath though I am to admit it – it wasn’t the worst either.

Mahler, Mahler and anyone who even remotely knew Mahler. There is, of course, more to the South Bank's 2011 season listings than this but the great symphonic agoniser (and his many chums) forms the bedrock of the classical programming as we all go wild for the centenary of his death this year. In contemporary music big names such as Rumer, Elaine Paige and Brian Wilson will pack them in, while newcomers like Josh T Pearson and Melissa Laveaux have first Southbank exposure. The London International Mime Festival in January leads off dance and performance, which has a child-friendly look this year. But watch out for the digital-electronic Rites, fascinating last time round and now welcome back for a second experience.

Earlier this month, George Osborne, Vince Cable and Jeremy Hunt were spotted in a Royal Opera House box surveying the country's most expensive artistic patrimony. What they thought - and how they and the Arts Council might wield their axe - will change the musical landscape of Britain forever.

The heroics came fast and fervently with Andris Nelsons and the Philharmonia Orchestra emerging from suffocating pianissimi to rip out the exultant fanfares of Beethoven’s Leonora No 3 Overture as if already limbering up to take on Strauss’s critics in Ein Heldenleben. That he saw them off so decisively didn’t, on his present form, come as much of a surprise. Nelsons doesn’t need anyone to fight his battles for him – not even the egotistical Strauss.

A member of Miles Davis's legendary second quintet (“arguably Miles's best ever group” according to the Penguin Jazz Guide); a composer of standards (“Watermelon Man”, “Dolphin Dance”, “Maiden Voyage”, “Cantaloupe Island”) and soundtracks (Antonioni's Blow-Up, Bertrand Tavernier's Round Midnight); winner of over 10 Grammy Awards, the first for his 1983 hit single “Rockit”, the most recent for his magnificent 2007 Joni Mitchell tribute album River: The Joni Letters (one of only two jazz recordings to win the coveted Album of the Year award, the other being Getz/Gilberto over 40 years ago). Whichever way you cut it, pianist Herbie Hancock is one of the lodestars of American music, whose influence reaches out far beyond the narrow confines of jazz. A brilliant extended set from this bona fide jazz icon brought a capacity RFH audience to its feet.

Talking to Jude Kelly at the Royal Festival Hall last night, Stephen Sondheim gave a glimpse into his own theory of lyrical composition by contrasting Noël Coward (whom "I intensely dislike") and Cole Porter.

Just seconds into a performance by the Orquesta Sinfónica Juvenil Teresa Carreño it is immediately clear what Sir Simon Rattle meant when he said, “I have seen the future of music.” The passion and physical and mental energy with which they play, along with the sheer joy they seem to glean from it, is enough to instill hope in even the staunchest cultural pessimist.