Iestyn Davies is at the Wigmore Hall on Sept 21

IT isn’t hard to predict that the most momentous musical experience of the coming week will be the Queen’s funeral at Westminster Abbey on Sept 19. As I file this column there’s no indication of what the music will comprise; and as I’m not expecting to be on the invitation list, it’ll be a TV-watch for me (most likely for you too, unless you’re somebody important).

But this is an event that the Abbey has, in a slightly macabre way, been planning for years: its choir is arguably the finest of its kind in Britain; and you can expect its director of music James O’Donnell to deliver something spectacular – not least because this will be the culmination of his career there, falling just before he leaves after 22 years in office.

So quite apart from the solemn significance of the funeral, be prepared for music that befits a great occasion. And though less exalted, there will be local churches gearing up their choral offerings on Sunday with sung requiems for the Queen – including All Hallows Gospel Oak which promises the Faure Requiem at 10am.

• With affairs of state bearing down at speed like something from Shakespeare, some concerts around the weekend have been cancelled, and those that haven’t may yet disappear – so check before turning up. But dates that seem to be unchanged include the legendary pianist Elisabeth Leonskaja, flying in for a lunchtime recital at LSO ST Luke’s, Sept 16, playing Schubert: lso.co.uk – And keyboard enthusiasts will also be pleased to know that Angela Hewitt is at Wigmore Hall on Sept 22, playing Bach (it’s what she’s famous for) but also demonstrating that her interests extend to other things, with Mozart and Chopin sharing the programme: wigmore-hall.org.uk

• The Wigmore also has something out of the ordinary on Sept 21 when two countertenors – the celebrated Iestyn Davies and hot new arrival Hugh Cutting – appear side by side in vocal duets by Monteverdi, Handel and other baroque masters (wigmore-hall.org.uk)

And for a comparably charismatic pairing the following night (Sept 22), the Festival Hall brings together the cult figures of Nordic conductor Santtu Matias Rouvali and Nordic pianist Vikingur Olafsson in a performance of John Adams’ Must the Devil have all the Good Tunes: a sort of tongue-in-cheek piano concerto steeped in the soundworld of American rock and funk. For more conventional tastes, the programme also has Mahler’s 5th Symphony: the one with the Adagietto borrowed by Visconti’s Death in Venice. southbankcentre.co.uk

• Lastly, one of Haydn’s undervalued operas comes to St John’s Smith Square on Sept 16 – which is worth noting because Haydn operas are so rarely done these days. Its true they’re nowhere in the league of Mozart’s, but they have their moments. And Il Mondo della Luna – which Bampton Classical Opera is staging in English as Fool Moon – has plenty of moments that ennoble an otherwise silly story about duping someone into the belief that he’s on the moon. A sort of crazy 18th century romcom, it’s funnier than you’d think. And, as Bampton’s advertising puts it, out of this world. sjss.org.uk