Purcell’s The Fairy Queen is a riddle to which directors must find an answer. The problems posed by a work whose theatrical characters have no foothold in the musical interludes, whose text is an awkward composite of almost-Shakespeare and not-at-all-Shakespeare, whose unedited action can easily swell to a will-sapping four hours are not to be underestimated, but to address them by adding further narrative layers, further dramatic frames and meta-theatrical flummery is at best questionable and at worst wilful.

Restoration theatre has the reputation of being a rake’s paradise – all those randy young aristos in hot pursuit of buxom wenches. But even in the depths of 17th-century playwriting, there was room for repentance and regret among the discarded petticoats and ripped bodices. So it is with Stephen Jeffreys’s The Libertine, his now sharply rewritten 1994 play that was also made into a film starring Johnny Depp.

What's in a name? Imogen has a softer music to it than Cymbeline, the only one of Shakespeare's plays in which the title character is marginal, and the daughter certainly dominates in a way that her regal father doesn't. So Cymbeline Renamed, as half the subheading of Matthew Dunster's bold production puts it, is fine.

The confidence trick to end all tricks, Ben Jonson’s The Alchemist is so utterly recognisable, so clearly contemporary, that to update the setting feels a bit like underlining the point in red pen. In this transfer from Stratford's Swan Theatre director Polly Findlay plays things 17th-century straight, allowing her audience to make the connection with just a little help from an irreverent new epilogue.

They dreamed the impossible dream in 1970, turning aspects of Cervantes' Don Quixote into the musical Man of La Mancha. But Purcell, Eccles and the lively dramatist Thomas D'Urfey - anyone know his hit song "The Fart"? - got there first nearly 300 years earlier when the Knight of the Woeful Countenance trod the boards at Drury Lane's Theatre Royal in a seven-hour entertainment.

What price a human soul? That’s the question Marlowe’s Doctor Faustus asks – a question whose answers are rooted in faith and theology. But in a society with little use for faith and still less for theology, how do you reframe the question? Director Maria Aberg offers a deft if not always entirely coherent answer in her breathless, punky take on the play for the RSC.

The BBC Proms is the largest classical music festival in the world – an event whose ambition, accessibility and breadth wouldn’t be possible without the Royal Albert Hall and its capacity of well over 5,000 people. But the building that makes this festival possible, that provides the space for the hundreds of Prommers who fill the arena each evening, is also its biggest curse. Its unwieldy, awkward acoustic is a problem that must be faced and resolved every night, and when it comes to Early Music, it’s a resolution that’s partial at best.

So much has happened since the first of June when Versailles flounced on to our screens with its flowing locks and flashing cocks. The British people have voted to widen the Channel, the Conservatives have a new leader, Labour doesn’t have one and Christopher Biggins has been expelled from the Big Brother house. As Louis XIV might have said: plus ça change…

The story of Queen Christina Vasa of Sweden has been told in opera, novels and on stage. It was first addressed by cinema in 1933 when Greta Garbo played the title role in Rouben Mamoulian’s Queen Christina. Liv Ullmann then took the part in 1974’s The Abdication.

New England in the 17th century is the primordial soup of American horror: where Nathaniel Hawthorne’s Hettie Prynne received her Scarlet Letter, the vampire nest in Stephen King’s Jerusalem’s Lot was seeded, and Arthur Miller’s The Crucible tested original, hysterical sins. There is a small, parallel English strand including some of its cinema’s most affecting horrors, too – Matthew Hopkins’ Civil War rampage in Witchfinder General, A Field in England, and The Blood On Satan’s Claw’s slightly later, sexually raw tale of a possessed village.