Much as I love Strauss’s Ariadne in its final form, I have a sneaking nostalgia for the original version (attached to Hofmannsthal’s adaptation of Molière’s Le bourgeois gentilhomme), which had Zerbinetta and her companions popping up after the final love duet and gently letting out some of its gas.

There is a tide in the best-planned festivals that comes in and out almost imperceptibly, bringing with it changes as the days move on. Put it down to the kind of perfect planning that discards any one rigid theme, and to forging long-term links with performers who don't just pop in for one concert.

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.

A magnificent riven oak with gnarly branches stands in the secluded graveyard of SS Peter and Paul's Church Peasmarsh, near Rye. Transport it in your mind to Flexham Park in a very different part of Sussex, imagine it struck by lightning and it could be one of that twisted group which Elgar encountered on a short walk from his Bedham cottage in the summer of 1918, subsequently permeating his massive and masterly Piano Quintet with the ghost  story surrounding them.

The Secret Mass: Choral works by Frank Martin and Bohuslav Martinů Danish National Vocal Ensemble/Marcus Creed (OUR Recordings)

In a classical recording industry seemingly obsessed with marketing beautiful young female violinists, but very often presenting them in repertoire to which most of them seem to have little individual to add, how do you make your mark? Norwegian Eldbjørg Hemsing came up with a bright idea typical of a thoughtful approach in which the music always comes first: to twin a 1914 concerto she genuinely admires by a compatriot very few people will know, Hjalmar Borgstrøm (1864-1925), with what is perhaps the ultimate 20th century challenge to violinists, Shostakovich's First Violin Concerto.

Hans Abrahamsen String Quartets No. 1-4 Arditti String Quartet (Winter & Winter)

They were billed as a Trio, but when the classical super-group of Janine Jansen, Mischa Maisky and Martha Argerich came together at the Barbican last night it was in a sequence of different combinations, each with their own musical identity. The centre of gravity, however, remained constant. Martha Argerich, the only performer present throughout, may have reinvented herself and her sound fifty times in the course of the evening, now asserting, now effacing, but it was she who rooted the whole, who provided the fixed compass point around which her colleagues roamed so freely.

Jörg Widmann writes fast. He is also one of the few young German composers who can write distinctive and idiomatic music without feeling the weight of his country’s musical heritage on his shoulders at every turn. Surprisingly, then, his Clarinet Quintet, which here received its UK premiere at Wigmore Hall, was eight years in the making, and was initially abandoned because "music history ... suddenly appeared as a great burden".