Send in the clowns, as they sing in this palace-of-varieties first act, not for Pagliacci, Leoncavallo’s sole foothold on today’s operatic repertoire, but for the fool-for-love heroine of a sparkling, swooning rarity. Musically, Zazà is a notch above Mascagni and Giordano for orchestral delights, just below supreme genius Puccini, but its admittedly thinly-spread plot ends by being rather remarkable.

In 1987 Def Leppard released Hysteria, a high-water mark in the history of soft rock. Not only was it gloriously infectious but there was also a moving backstory. To recap: the band’s drummer, Rick Allen, lost an arm in a road accident during recording. The group’s response was to help Allen build a custom, digital drum kit and carry on. This new set-up forced them all to tighten their focus, and the result combined technical excellence, good taste and real passion. Sadly, it was arguably the last really decent record they ever made.  

This Barbican concert began with a Mendelssohn overture and ended with a Haydn symphony. But on stage were the BBC Symphony Orchestra and Ilan Volkov. What did you expect in between, a Mozart piano concerto? Not likely. Instead they gave the first performance of No.48 (night studio) by Richard Ayres. English-born but resident in the Netherlands and working mostly on the Continent, Ayres has impeccable post-Minimalist credentials (studies with Louis Andriessen and Morton Feldman) which do no more than hint at how his music behaves – like a kid in a well-stocked acoustic sweet-shop.

This was Henryk Górecki beyond the Third Symphony. His otherwise ubiquitous masterpiece was notable by its absence from yesterday's programme. That was surely a conscious decision, and a wise one, allowing his many other important works to come out from its shadow. Górecki turned out to be an ideal subject for the BBC Symphony Orchestra’s “Total Immersion” treatment. His music gradually evolved throughout his career, from acerbic neoclassicism, to esoteric serialism, and then to austere minimalism.

In 2007, Jiří Bělohlávek set the distinctive seal on his leadership of the BBC Symphony Orchestra and their ongoing Mahler cycle with a riveting performance of the Third Symphony. The legacy he established of a deep, well-moulded string sound which the orchestra didn’t really have before has left its mark on his successor Sakari Oramo’s even more impassioned attempt at the most epic of all Mahler’s symphonies.

“A rich and eclectic sequence of works” was the promise made in this evening’s concert programme. It certainly was that, with the Last Night festivities taking in new and old, well-known and obscure, plus a handful of celebrity soloists for good measure. The audience was predictably ebullient, generating the kind of atmosphere you only get at the Last Night of the Proms.

Queen Margrethe II of Denmark attended Nielsen’s 150^th birthday concert earlier this year in Copenhagen’s glorious new concert hall. Her grandparents were there at the premiere of Nielsen’s blithest work, his cantata Springtime in Funen on 1921. Our own dear Queen has never shown such interest in music, but all the same last night's Prom celebrated the day on which she became our country’s longest reigning monarch with Gordon Jacob’s fanfare-laden arrangement of the National Anthem.

Last night's Proms performance of Sibelius's Kullervo symphony was radiant, unforgettable, but there has also been a pure coincidence this past week which is simply too good to pass over unremarked: Thursday also saw the first-time publication of J.R.R. Tolkien's version of the same narrative, The Story of Kullervo.

It’s been glorious to hear so much Bach at this year’s Proms – most of it after dark, and still more of it for the most intimate of forces. On paper, the Academy of Ancient Music and BBC Singers’ Late Night concert of Bach choral works didn’t quite have the mystique of Ibragimova’s Solo Sonatas and Partitas, Schiff’s Goldbergs or Ma’s Cello Suites. In practice, though, it was clever piece of programming that came into its own in its Friday night slot, sending people home to the weekend on the very highest of musical highs.

Nearly 10 years ago to the day, an almost unknown 24-year-old Venezuelan conductor came a cropper when valiantly stepping in at short notice to conduct Sibelius’s Fifth Symphony at the Proms. (His name was Gustavo Dudamel. Whatever happened to him?) To pull off successful performances of Sibelius’s seven symphonies you need not just the ability to fire up players but the intellectual grasp to grip their elusive, fluid structures.