Of all the rock pantheon, Joni is the one who has evaded definition and over-determination better than anyone. The seemingly ethereal folkstress who partied with the most grizzled rockers and left them weeping for their mothers; the lover of the rock'n'roll life who can sing jazz standards and stand with the very greatest; the musical maestro who prefers to see herself as a painter - for all the reams of text written about her, the depths of armchair psychoanalysis attempted on her, Joni is always something other, and something more than anything you might expect.

French-Canadian pianist Hamelin has the technique and the stamina to play anything, which is why the note-crazy, obsessive “Night Wind” Sonata of Nikolay Medtner buzzed around at the heart of his recital. But between the proud resonance of its many climaxes and the distant voices he showcased so effectively in his own Barcarolle – three movements rather than one, unexplained in a note which simply ignored it – there’s little delicacy in the middle ground.

It’s taken Avril Lavigne more than a decade to release a self-titled album, but in some ways it’s appropriate: after all, the Canadian singer’s best music still sounds exactly like what she was releasing as a teenager. The difference is that when she first burst onto the scene, all sweatbands and heavy eyeliner, Lavigne was a breath of fresh air - but now, on her new album, she seems to be taking her cues from the women she blazed the trail for.

There are few more beautiful places in the world to make music than Banff, the arts community founded in 1933, originally to teach drama. From small beginnings it became a name uttered with a certain reverence among the music world. And that is still true today, despite the fact that the centre is now as populated by conference attendees and "leaders of the future" as musicians, dancers, writers and artists.

Carey Marx, Gilded Balloon ****

Carey Marx couldn't come to the Fringe last year, because of the small matter of having a heart attack. But, looking on the bright side, the experience has given him his new show, Intensive Carey, in which the comic tells his story without a trace of self-pity and with a keen sense of the absurd.

Schoolchildren drowning under a frozen lake in their crashed bus is the image most people still associate with Atom Egoyan. The Sweet Hereafter (1997), which pivots on that scene (the ill-fated bus is pictured below), gained him Oscar nominations as director and screenwriter, and reinforced the breakthrough made by Exotica (1994), in which a man harbouring an awful secret you dread being revealed keeps coming back to a strip-club’s schoolgirl-costumed dancer.

"When you are in the middle of a story it isn't a story at all, but only a confusion," writes Margaret Atwood in Alias Grace, and it's these words that open Stories We Tell, fellow Canadian Sarah Polley's fourth film. This is Polley's first documentary - although it hardly does it justice to call it that. It starts by telling a family story - a story Polley herself is indeed smack bang in the middle of - which requires her to be both director and detective, and presents her with the seemingly impossible task of distancing herself.

Katie Stelmanis of Austra has a voice that will send many listeners running to the hills. It is at once precocious and pretentious, running the gamut from quavering through a mouthful of marbles to operatic to cutesy, like the mutant offspring of La Roux, Paloma Faith and Knife/Fever Ray front woman Karin Dreijer Andersson. However, although it might take a moment or 10, once the ear has adjusted to her warbling theatrical style, there’s much to enjoy in Austra’s music.

Imagine the rising and falling piano cadences of Gershwin’s Rhapsody in Blue. Then plug the gaps between each note with any of those which may have been encountered on the path to the next. Once that’s done, ensure that the playing is constant with each note bleeding into the next. Mesh the result with a similar composition played at the same time and you have some idea of how Lubomyr Melnyk’s “Windmills”, his final piece last night, sounds.

The combination of Romeo, Juliet and the choreographer Alexei Ratmansky should be almost too much for the blood pressure. Those defiant lovers, that emotive yet intellectual young Russian craftsman of ballet. Hence the huge turn-out of balletomanes for National Ballet of Canada at Sadler’s Wells last night.