“Telegram Sam” by T. Rex spent its second and final week at the top of the singles chart in the week of 12 February 1972. A month later, on 18 March, Marc Bolan and his band played two shows at Wembley’s Empire Pool to a sell-out crowd under the spell of what was labelled Bolanmania or T. Rextasy. Bolan seemed unstoppable. Before “Telegram Sam”, the success of “Ride a White Swan”, “Hot Love”, “Get it on” and “Jeepster” suggested he was as big as The Beatles. Fittingly, a real-life Beatle directed the camera crews capturing the Wembley shows on film.

The names may be unfamiliar, but Folque and Undertakers Circus are as good as better-known bands. Despite being musical bedfellows neither Norwegian band is as esteemed as, say, Trader Horne and Trees or Colloseum and Lighthouse. Folque issued their eponymous debut album in 1974. Despite line-up changes, the band was active until 1984. Undertakers Circus issued two albums, the first of which was 1973’s Ragnarock. The original band ran out of steam around 1976. Original pressings of Folque fetch between £40 and £80.

Penda’s Fen has so many constituent parts it could burst its seams. Almost-18 schoolboy Stephen Franklin is struggling with determining the nature of his sexuality. His school is about regimentation and promotes the army with drill, uniforms and expectations that commands are to be followed. With his father, the Reverend Franklin, Stephen has prolonged discussions about the nature of faith. The local landscape is mystical, and seems able to manifest historic and mythical figures from its own past. Reawakened Paganism is upsetting the Christian present.

The immediate reaction to Close to the Noise Floor is “Why hasn’t anyone done this before?” This new four-disc set’s subtitle captures its objective in a nutshell: to collect Formative UK Electronica 1975–1984 – excursions in proto-synth pop, DIY techno and ambient exploration. While the stars include Blancmange, John Foxx, Throbbing Gristle and the big cult names Bourbonese Qualk, Legendary Pink Dots and Instant Automatons feature, the less well-knowns Sea of Wires, We be Echo and Muslimgauze are also collected.

Is there anything left to say about Sandy Denny? Sadly, she cannot say anything herself, as she died in 1978. So it’s left to what she released during her lifetime, posthumous appraisals and reappraisals, and packages and repackages to do the talking.

The exhibition starts promisingly. You can help yourself to an orange from Roelof Louw’s pyramid of golden fruit. Its a reminder that, for the conceptualists, art was a verb not a noun. Focusing on activity rather than outcome, these artists were committed to the creative process rather than the end product. The idea was what mattered, and if it led to an open-ended exploration, so much the better.

Magical Surfaces: The Uncanny in Contemporary Photography focuses on two contrasting generations. Beginning in the 1970s, Stephen Shore and Joel Sternfeld travelled America photographing things that are so ordinary, yet so odd, that they transcend the familiar to become surreal. And alongside them are five Europeans, 20 or so years younger who, by and large, seem glued to their computers. 

When it aired on BBC One at the dawn of the Seventies, Doomwatch became one of the marvels of the broadcasting age, sometimes pulling audiences of over 13 million. Thanks to the keen imagination of its creator, Dr Kit Pedler – a gifted scientist and environmental campaigner – it possessed an apparently clairvoyant ability to seize on cutting-edge scientific ideas and their potential for running dangerously amok.

Art can inspire music, and vice versa. When concert (as opposed to theatre or film) scores are accompanied by images, however, the effect dilutes the impact of both; above all, the imagination stops working on the visual dimension created in the mind's eye.

Dr Robert Laing (Tom Hiddleston) feels he’s “living in a future that had already taken place”. Director Ben Wheatley, too, has made a late-arriving Seventies exploitation pic from JG Ballard’s 1975 novel. High-Rise is a highly sexy and violent look through a distorting lens at both that familiar past, and the way we live now.