This is a great spring for dance-lovers. Tucked in for two nights at Sadler's Wells (catch it again tonight) is the return of Wayne McGregor's FAR, well timed to appear just before his latest ballet at Covent Garden next week. Uniquely among choreographers today, McGregor has two lives; two selves; two creative identities. The better known is that cool cult-leader at the Royal Ballet, with his slink-and-fidget on pointe that looks so trendy on classically trained ballerinas.

The one thing you can count on at an Alston evening is the quality of the music: everything Alston does, and everything he creates for his dancers, revolves around the music. In his wonderful Roughcut, Steve Reich’s New York Counterpoint for clarinet and tape begins before the house lights dim, his sharp, vibrant phrases giving a sense of urgency to the audience before they have even settled down.

Sergei Polunin’s flight this week from the Royal Ballet just as he rises to the pinnacle made last night's Sadler's Wells show a very hot ticket for those who wanted to catch his guest appearance in it. But the evening was also a proclamation that this isn’t the first time that company has mislaid one of its finer talents.

The year’s best arts story was not the cuts (which isn’t art, it’s politics), but the appearance in Edinburgh of a mysterious series of 10 magical little paper sculptures, smuggled into the city’s libraries by a booklover. No name, no Simon Cowell contract - it proved the innocent gloriousness of the human impulse to make art, a joy that has no expectation of reward but without which no existence is possible.

It is unusual in art for collaborators to be of equal star-wattage. The pairing of Benjamin Britten and WH Auden was one such. Another, much longer-lasting, was Stravinsky and Balanchine, a partnership of equals that endured for nearly half a century. More recently, Antony Gormley has worked with both Akram Khan and Sidi Larbi Cherkaoui, to great effect. Can Turnage, McGregor and Wallinger replicate these? This has been the question.

When the subject of funding for the arts arises, the phrase “allowed to fail” is frequently heard: artists must be enabled to try new things, press against the outer edges of what they know. Enter Anne Teresa De Keersmaeker and Jérôme Bel, two of contemporary dance’s thinkers. They have tried, and failed, to choreograph the final section of Mahler’s Das Lied von der Erde, and in that attempt, they have produced an extraordinary evening: the anatomy of a failure.

Rambert is making a thing of acquiring classic works from the 20th-century contemporary repertory – and a very good thing, too. First staged by them last year, RainForest, a minor Merce Cunningham piece from 1968, was recently performed by the Cunningham company itself, in London on its final tour. And yet, while that performance was straight from the horse’s mouth, I think Rambert (whisper it) in reality do it better.

Time is a rare privilege in a choreographer’s career - in Britain, anyway. We don’t have the equivalents of Merce Cunningham, Martha Graham or Paul Taylor, who build careers into their eighties and beyond, with mighty efforts from private patrons and friendly art giants of their generation (Andy Warhol, Robert Rauschenberg, Isamu Noguchi et al). UK choreographers are fortunate to get 10 years until the Arts Council deems it time to push them out of the subsidised nest, to vanish in their late thirties, most of them.

There are various disinterments of supposedly iconic dance-makers going on in this year's Dance Umbrella (some live ones more dead than the dead ones), but no one is going to beat for sheer éclat Lucinda Childs’ astonishingly beautiful minimalist 1979 creation Dance, on this week at the Barbican.

Minimalism is now a comfortable old sofa for today’s generations of dance-watchers, often handed very small platefuls of ideas, but this 60-minute piece has an understated poise and rich cleverness that shows American modern dance at the very top of its artistic game.

I wasn’t around to see when Karole Armitage won her spurs in her twenties as a punk ballet choreographer in America in the 1970s and early Eighties, so we must rely on her programme-sheet biography to explain to us that she is “seen by some critics as the true choreographic heir" to George Balanchine and Merce Cunningham. After last night’s dismal showing by her group, Armitage Gone! Dance, at the Southbank Centre, the only possible response is, “Pull the other one” and a firm slap across the hubris.