If there's one electronic sub-genre that is not worth approaching blind it's “tech-house”. Since the late Nineties, it has tended to be the most functional and generic of club soundtracks, a steady, decadent plod, all clean lines and predictable shifts: nothing to frighten the horses or interrupt the steady progress of weekend hedonism. In short, boring.

Tubular Bells, the first half of which is being currently revived as a live piece in the UK, sold between 15 and 17 million units worldwide. Quite apart from the work’s innocence being co-opted and made spooky in William Friedkin's The Exorcist, there was something about Mike Oldfield’s first stab at quasi-symphonic rock which seduced the music-consuming public.

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.

An album that encompasses pan-global collaborations, iPad/Phone apps, internet jiggery-pokery, art installations, live multimedia shows and even a tuning system, with the “Ultimate Edition” of the album coming complete with a set of tuning forks to demonstrate this. As ever, Björk Guðmundsdóttir is showing no shortage of ambition. But is it any good?

Strings waft in, then coalesce like banks of fog. A piano picks out single notes. Space is left between them. With no immediate rhythmic patterns, the minimalist A Winged Victory For The Sullen make music for becalmed oceans. This collaboration between Adam Wiltzie and Dustin O’Halloran could have come form the deck of the Marie Celeste.

One thing became clearer to me last night – just how much Steve Reich has borrowed from world music in his compositions – we had the flamenco-tinged Clapping, Electric Counterpoint, using Central African guitar lines, and Music for 18 Musicians, a mix of West African rhythms, Indonesian gamelan and other elements. It was also clear how much a sold-out late-night Prom audience had taken this music to their hearts, nearly 40 years after some of it was written. It still sounds fresh and, rather than being mindlessly repetitive, most of it shimmers away.

Ólafur Arnalds used to drum for a hardcore band called Fighting Shit. But since 2007 he’s produced a string of achingly emotive CDs that integrate sparse piano, keening strings and subtle electronic texture. He’s Icelandic and, inevitably, his instrumental music is usually described as evoking empty landscapes and long stretches of darkness. But judging by last night's concert, his sunny outlook, affability and humour cut dead all thoughts of dark nights of the soul feeding his muse.

All ballet companies dream of finding a genuine creative talent among their ranks, and the Royal New Zealand Ballet, visiting from the farthest end of the world ballet map, have one in Andrew Simmons. The unknown name on their triple bill on this rare visit to London shows a young mind drawn naturally to grace and understated expressiveness.