One of the more harmless pastimes of us retired academics is rummaging around among the so-called minor contemporaries of great and famous composers. It often turns out that quite a few of them aren’t minor at all, or at least not minor enough to have to have retired academics dig them out.

Mahler’s Fifth Symphony is a repertoire piece nowadays, probably as familiar to as many listeners as to orchestral players, which means you look for something distinctive in any performance to identify its essential quality against all the others.

Every ten years or so Thomas Adès writes a piano concerto and the latest had its UK premiere last night at the Royal Festival Hall, played by Kirill Gerstein and conducted by Adès himself.

The Oslo Philharmonic finished its centenary tour of Europe at the Barbican last night with ample proof that it consistently delivers one of the continent’s most well-rounded, and richly satisfying, orchestral sounds. The Norwegians’ modern history may date to 1919, but their stellar reputation only emerged in the 1980s. Then Mariss Jansons, just like Simon Rattle over in Birmingham, shaped a supposedly “provincial” outfit into a regiment of world-beaters.

There are now two septuagenarians playing Schubert at a level no other living pianist can touch.

We have John Eliot Gardiner to thank for an unconventional diptych of Czech masterpieces in the London Symphony Orchestra's current season. He had to withdraw from last night's concert - he conducts Dvořák's Cello Concerto and Suk's "Asrael" Symphony on Thursday - but his replacement, Kazushi Ono, was no second-best.

"Revelatory":  it’s one of those words which is now completely devalued through having been carelessly dropped into a thousand press releases.

Some of the greatest pieces of the string orchestra repertoire are based on pre-existing pieces: the fantasias by Tippett and Vaughan Williams, on Corelli and Tallis respectively, treat their starting material with invention and sweep, creating something new, bigger and better than their sources. But throughout Lera Auerbach’s Dialogues on Stabat Mater (after Pergolesi) last night I felt nothing other than the desire to hear the Pergolesi original, unadorned and unmeddled-with.

Changes from the artists originally advertised can bring some happy discoveries. Sir Mark Elder, though present in the audience to hear last night’s Hallé performance at the Bridgewater Hall, was still recovering from surgery and so did not conduct it, as he’d planned to when the season was announced. Instead, the Hallé Youth Orchestra’s music director (and noted choral director) Ellie Slorach took the baton for the first work in the programme – Weinberg’s Rhapsody on Moldavian Themes.

It remains some of the most terrifying music ever written. Shostakovich’s Tenth Symphony - the composer’s portrayal of the fear and anxiety felt under Stalin's regime - is a horrifyingly brutal musical portrayal of life lived under a totalitarian reign.