Music-lovers who normally balk at the sight of national colours in a concert hall would surely have forgiven the little Estonian flags – in stripes of blue, black and white – that waved happily at the conclusion of this Prom.

When did this weird mix-tape fashion take root at the Proms?

In the beginning, Sir Antonio Pappano created a little chaos of his own.

It was all about the acoustic. Well, almost. Disregarding the awe-inspiring grandeur of the Royal Albert Hall, there’s a school of thought that believes the Proms is the world’s greatest concert series in the world’s worst hall. Why? Because its problematic acoustic is so ungovernable.

The heart of Prom 33 was Brahms’s massive German Requiem, a piece that eschews Christian dogma and Day-of-Judgment terrors for a humanism focusing on consolation of the bereaved.

Prom 31 featured an American orchestra playing an all-American programme – until the final encore dived thrillingly into a completely different musical tradition. But one of the principal features of American music – its joyous risk-taking – was undermined by conductor Osmo Vänskä’s cautious tempos, and the orchestral playing only periodically caught fire.

A complex Swedish product to unpack, this one. Someone in the BBC must have worked out that it could do with a detailed instruction manual to help people with the task: the programme booklet duly ran to a full 50 pages.

Anyone who came to the National Youth Orchestra’s annual Prom in the hope of hearing some roof-raising feelgood blockbuster might have slunk out disappointed into the tropical night of Kensington. What an ambitious, high-concept menu Sir George Benjamin slated for the teenaged regiment – over 160 of them at full strength – and how confidently they served (almost) all of it.

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.

This concert was inspired by the huge scale of the Albert Hall. The three works all evoke spacious vistas, through their expansive textures, echo effects and horn calls.