Once the Proms season is under way, you soon regret dissing the prospectus.

What a fabulous score Pelléas et Mélisande is, and what a joy to be able to hear it in a concert performance without the distraction of some over-sophisticated director’s self-communings. Well, if only.

The fourth Prom of this season featured only two contrasting pieces, pitching the unabashed joyfulness and good humour of Lindberg’s Clarinet Concerto against the angst and defiance of Shostakovich’s “Leningrad” Symphony. It was the former that left the greater impression.

Light-filled Cadogan Hall is hosting the most fascinatingly programmed concerts in a Proms season not otherwise conspicuous for its adventurousness. There's also an honourable pledge to premiere at least one new work by a female composer in each event, honouring the centenary of votes for women.

How do you go about co-ordinating a spectacular like this, the first ever BBC Young Musicians' Prom? With 23 brilliant soloists from clarinettist Michael Collins, not even the winner of the first event 40 years ago, to 16-year-old Lauren Zhang, who stunned us all with her fleet interpretation of Prokofiev's monster Second Piano Concerto this year, commissions or reworkings dealing with batches were the best idea. And all of them worked superbly.

The First Night of the Proms is always a tricky one to programme, bringing together themes of the season, perhaps a new work and, most importantly, a grand finale. This year’s Prom No. 1 ticked all the boxes, and without feeling like pick-n-mix.

They started as they meant to go on. Randall Thompson’s lush, consoling six-minute Alleluia, written in 1940, couldn’t be a better opener for Tenebrae, one of this country’s finest, most musically alert and expressive vocal ensembles. Technically, the piece is undemanding so a successful performance of it rests entirely upon expressive control.

With – unusually – no visiting orchestra at this year’s St Magnus International Festival in far-flung Orkney (the fall-out from delayed funding confirmations, we’re assured), there was a danger that the annual midsummer event might have felt a little – well, quiet.

Manchester Collective is a new and enterprising group of musicians determined not just to create performances of high quality but to offer a new way in which the performances themselves are done. They started from scratch at the end of 2016, and I saw one of the first of their efforts, given at Islington Mill – a laid-back space in the basement of an old industrial building in Salford – in March last year.

In the right hands, the music of the various Viennese Schools can still sound almost startlingly original. Imogen Cooper’s are very much the right hands, containing a rare, refined artistry that only continues to grow with the years.