A giant arm sweeps across the rapt audience. The newly anointed onlookers all wear the same, white-framed, glasses. A chant is heard:“We are the robots.” Those congregating in the over-sized shoebox of Tate Modern’s Turbine Hall could be at a cult meeting. In gathering to pay respect, the audience share more than a passion for Kraftwerk. They also all wear the same 3D glasses. Performing their 1978 album The Man Machine in full, Kraftwerk restate the uncertainty of the natural order. Whether prophetic or not, their message still resonates.

To hear them tell it, Tegan and Sara have always been pop stars. It was harder to see a decade ago, sure, when they were spitting out spiky guitar anthems in matching pixie haircuts, but the roots were always there. That the twins’ seventh record drops the guitars so low in the mix as to render them almost inaudible in favour of bombastic electropop shouldn’t really be that much of a surprise - there were hints of it on 2009’s Sainthood, which itself came not long after they collaborated with DJ Tiesto.

If you listened to the last archived Arts Desk Radio Show you'll have heard me play a couple of tracks from this, and it was all I could do not to play more. As so often I'd gone into the studio with the previous couple of days' post pile and started picking through it for CDs to play. Usually this is a faff involving flicking through tracks and hoping one will jump out, but as soon as this one went into the machine, every single track got a tick by its name.

Santa has returned home, but he wasn’t the season’s only visitor from the Nordic lands. The crop of recent music in from the region embraces genre-crossing jazz, vintage-style rock, the expected electropop, cross-border collaborations and a seven-year-old Finn. Exploring all corners of Scandinavia’s music, theartsdesk journeys where no one else does, landing in Norway first for some finely formed jazz.

The House of Love: The House of Love

Kieron Tyler

Seasonal appearances by The Human League have an air of Christmas panto about them, with halls packed with coach parties of devoted fans who all seem to know each other, but the group have quietly solidified into a great British success story. They made the jump from experimental beginnings to become darlings of early-Eighties electropop, but more remarkable still is their ability to produce modestly credible new music 30 years later.

Ah, this starts so well. The idea of Claudia Brücken, arch-Teuton ice queen vocalist from high class synth poppers Act and Propaganda, covering the Bee Gees, Bowie and ELO is just too much fun to ignore. And her version of Julee Cruise's “Mysteries of Love” from the Blue Velvet soundtrack is damn near perfect – its lusciously sinister textures just right for her perfectly-controlled deadpanning. The downtempo take on Stina Nordenstam's “Memories of a Color” is tasty enough to keep hopes high.

Now I think I've seen it all. After a storming two-hour set Ultravox returned to the stage for a celebratory twin-pronged past-meets-present encore of "Dancing with Tears in My Eyes" and "Contact". At the very end, during a touching, soft-spoken moment, a female fan in an animal mask clambered onstage and appeared to drop a bowl of greeny-yellow gunk, possibly custard, on Midge Ure's head. The woman was bundled off and a towel cleaned up the dapper vocalist, but the crude incident was in breathtakingly stark contrast to the glistening gig that had preceded it.

After Lady Gaga's concert at Twickenham last night, I asked some of the Little Monsters scurrying back to the station the name of the last song she had sung. The song she sang right after declaring that she had to bring the evening to an early end. The song she sang an hour after screaming that she would "sing her pussy off" and no one could stop her. Someone stopped her and no one could name it. (See Update in the penultimate paragraph.)

Pet Shop Boys eleventh album leaps sideways into smooth, opulent US FM radio production in a way that will initially give long term fans palpitations. The duo sound… different. They recorded Elysium in Los Angeles with Grammy-winning Kanye West producer Andrew Dawson and it sounds that way too.