Two pianists, one indisputably great and the other probably destined to become so, lined up last night to show us why the Proms at its best is a true festival, not just a gaggle of summer concerts. First there was the prince of pearly classicism, Paul Lewis, consolidating the democratic Beethoven he’s already established on CD withJiří Bělohlávek and the BBC Symphony Orchestra. Then along came the queen of romantic night, Maria João Pires, to unfold a late-night brace of Chopin nocturnes.

So most of us blinked and missed Martha Argerich gliding into Kings Place's Argentine celebrations last week. Yet here I am writing again about this liveliest of venues' Chopin marathon, and like a would-be Prommer who joins the last night party without having been to the Albert Hall more than once in the season I'm culpable of marking the grand finale after experiencing only a slice of modest Cypriot pianist Martino Tirimo's 10 concerts devoted to our bicentenary boy. Never mind: both the encyclopedic recitals I did hear seemed to take us through a turbulent lifetime. That would be true just of the essence, the 24 Preludes which concluded last night's strange adventure. But there was much, much more to feel and think about.

Fantasies in apparent freefall, though in fact ruthlessly organised and blindingly well executed, were the name of last night's game - an endgame, as it happened, to the BBC Symphony Orchestra's hardest-working Barbican season before the marathon of the Proms. Buzzing, fluttering myriads of notes by Tippett and Martinů swarmed around a very necessary still centre in the majestic personage of Elisabeth Leonskaja, that great Minerva of the keyboard holding us spellbound in Schumann and Chopin.

In every partnership there is a leader, and it’s not always the featured name. While the hall was packed with Ma followers for this rare cello-and-piano recital, what emerged was a richly sensitising foretaste of what the Emanuel Ax residency is going to offer over the next fortnight. This is one marvellous pianist.

Beware of Zimermania - or, for that matter, of idolising any pianist as the Greatest Living Interpreter of Chopin. Our birthday boy, 200 years old last night (and not on 1 March), as a crucial baptismal register now seems to prove, is too big for any one artist to dominate. He looks to his French heritage for sensuality, to the Polish maternal line for Slavic weight and thoughtfulness. If a sometimes impatient Krystian Zimerman inclined more to the former in yesterday's big celebration, that's not to deny he was a worthy choice of golden-toned celebrant. It was just a pity that it all had to be such a circus, and that the human zoo around the lone figure on the Festival Hall platform took so long to settle.