Whatever the recording industry may try to tell you, there is rarely any such thing as a single “best” among today’s pianists. We’ve had Benjamin Grosvenor and Leif Ove Andsnes, excellent artists both, touted as a cut above the rest. But hearing pianists in all corners of the world, you realize how much phenomenal and ungradable talent there is out there.

Who knew that the wisdom of crowds could be quite so fickle or so fallible? This superb recital by the American violinist Leila Josefowicz and pianist John Novacek was played in front of a Wigmore Hall only about a quarter-full. Josefowicz, returning to the Wigmore after five years, wasn't ruffled in the slightest. After all, a bigger date awaits her in just one week's time: next Thursday she is to give the world premiere of a new work by John Adams with the New York Philharmonic, for which Avery Fisher Hall is already close to sell-out.

Morton Feldman and Robert Schumann don’t often appear in the same sentence, but in his brief platform introduction Alexander Melnikov perceptively located common ground: they are two of the greatest writers on music, both for their polemical intent and their vivid imagery. It can be hard to avoid analogy and metaphor when discussing Feldman’s music, but why bother trying? The composer himself wrote of Triadic Memories (1981) that “Chords are heard without any discernible pattern.

Ernst Krenek is probably best remembered nowadays as the composer of Jonny Spielt Auf – the quintessential Zeitoper of Weimar Germany and later the archetype of all that was designated “degenerate” in art by the Nazi regime. And perhaps also as – briefly – the husband of Anna Mahler, daughter of Gustav. But Krenek was far more than that. He was a magpie collector of styles and influences whose large corpus of work reflects almost every major 20^th-century trend.

The mixed grilled school of programme-making is not for the JACK Quartet. Contemporary, contemporary, and contemporary: that was the bill of fare last night at this challenging recital offered by the young American group, graduates of the Eastman School of Music, who derive their capitalised title from the initial letters of the members’ first names. Like the Arditti String Quartet, one of their mentors, you’d never find them playing Schubert. Even someone as gutsy and game-changing as Beethoven appears to be well off the menu.    

This recital had looked so good on paper. The charismatic Dutch violinist Janine Jansen, with Itamar Golan at the piano, would bring all the brooding darkness of late '60s Shostakovich to life, and would then charm and finally dazzle in Ravel. In the hall on the night, and in particular in the second half, she didn't quite live up to such expectations.

Of Alexander Nikolayevich Scriabin, who died 100 years ago aged 43, it was said at one time (by Rimsky-Korsakov) that he was “warped, a poser and opinionated”, at another (by Boris Pasternak) that he could seem “as tranquil and lucent as God resting from his labours on the seventh day”. Only Pasternak’s definition applies to the magnificence of Garrick Ohlsson, a lion couchant who can use his wings to fly into the sun when Scriabin so requires.

Even the most reluctant of completists should find the prospect of the Beethoven works for cello and piano undaunting. In their totality, these pieces consist of just five sonatas and three sets of variations, which fit neatly on to just two CDs, or occupy two recital programmes. The works are also very important in the early development of the solo cello repertoire. Beethoven biographer Jan Swafford describes the “confident, ebullient, fresh and youthful” sonatas of Op 5 as a genre which the composer, at the time, had “virtually to himself".

What a day for piano-lovers and Beethoven-lovers – Elisabeth Leonskaja for lunch, Maria João Pires for supper. Beethoven from both, stupendous playing from both, all in all generating a general sense of disbelief in this member of the audience. I mean, really! The Wigmore Hall is the epicure’s choice for music, but even by Wiggie standards this was beyond expectations.

Musical theatre needn’t be dominated by the human voice. Instrumental dramas with an element of acting can be a good way into the wonderful world of chamber music for younger audiences, and the Wigmore Hall’s new gambit of special student tickets for contemporary music paid off with the very different crowd there last night. It was rewarded with playing of the highest imaginative order from soloists in their own right: violinists Patricia Kopatchinskaja and Pekka Kuusisto, viola-player Lilli Maijala and cellist Pieter Wispelway.