The Hope Six Demolition Project is an album with quite a story attached. Preparations for the follow-up to 2011’s Mercury prize-winning Let England Shake involved Polly Harvey travelling to Afghanistan, Kosovo and the grimmer parts of Washington DC in the company of film-maker and photographer Seamus Murphy, the better to record the effects of war and poverty. The field trips have thus far spawned a book of poetry and photographs called The Hollow of the Hand, and an open recording session-cum-art installation, during which the public were invited to stand behind a one-way glass and watch Harvey and her band making the album in a specially constructed studio in London’s Somerset House. There is a documentary film to follow.  Related: PJ Harvey: a singular talent, she dances to her own tune | profile  It’s a process that seems to have musically galvanised Harvey. In contrast to Let England Shake’s gauzy layers of echoing guitars and abstruse samples, The Hope Six Demolition Project deals in a kind of raucous simplicity. It involves thumping drums (heavy on the tom-toms), distorted guitars, massed Bad Seeds-like backing vocals, big, hook-laden choruses and really sharp, punchily effective tunes; it’s a long time since a PJ Harvey album felt as abundant in earworm melodies as this. The sound variously nods in the direction of electric blues, 60s garage rock and glam: The Ministry of Social Affairs opens with a snatch of Jerry McCain’s 1955 single That’s What They Want, the sax-assisted riffs recall the sound of Seattle garage pioneers the Sonics, and there’s a hint of T Rex’s 20th Century Boy in the monolithic, grinding guitar that drives The Ministry of Defence. There’s also another in what appears to be an ongoing series of cameo roles on PJ Harvey albums for suitably apocalyptic roots reggae: on Let England Shake, Niney the Observer’s Blood and Fire made a guest appearance; this time, A Line in the Sand concludes with Harvey singing the hook from Johnny Clarke’s None Shall Escape the Judgement.  All this is obviously fantastic, but there are other problems to contend with. Listening to the lyrics, you’re struck by the sensation that Harvey might have been simply overwhelmed by what she saw in Afghanistan, Kosovo and Washington. The closing Dollar, Dollar spends the best part of six admittedly beautiful minutes explaining that seeing a child begging is a haunting experience, something you almost definitely don’t need to visit Afghanistan to learn. In one page of the notebook reproduced in The Hollow of the Hand, you can see Harvey straining to find meaningful resonances in some rotting plums she had seen. “Don’t say the word ‘plums’,” she begins, perhaps concerned that a word with humorous connotations involving testicles is a tough sell as a metaphor for human misery. But she gives it a go anyway – “carnage on a battlefield, fallen plums … plums lay heavy and silent … ripe, rich, bloody” – before sadly concluding: “plums not good for song.” Medicinals imagines Washington DC’s past as a marshland where plants used by Native American healers used to grow, but there’s something really clumsy and trite about the final verse’s attempt to contrast this with the latterday image of a wheelchair-bound resident in a Redskins cap boozing from a paper bag-covered bottle: “A new painkiller for the native people”. As it turns out, medicinal herbs not good for song either.  It’s on firmer footing when Harvey goes for straightforward reportage, attempting to devise a lyrical equivalent of stark, black and white photojournalism. The Wheel depicts children in a village near Prinzen in Kosovo squealing with delight on a fairground ride, next to a building plastered with “sun-bleached photographs” of other children killed in ethnic cleansing. The Ministry of Defence starts out describing a derelict building in Afghanistan, vandalised in the way derelict buildings get vandalised the world over: strewn with graffiti and used as a toilet, filled with “drinks cans, magazines, broken glass” and drug paraphernalia. But then the image pulls sharply into focus. Among the litter, there’s “a white jawbone … human hair”: this isn’t like derelict buildings the world over at all.  Related: Washington DC to PJ Harvey: ‘She's to music what Piers Morgan is to cable news’  Tellingly, The Hope Six Demolition Project is better still when Harvey hands over the songs’ narrative voice to others. The Community of Hope more or less transcribes a Washington Post journalist’s running commentary while driving Harvey around the city’s roughest neighbourhoods, perfectly capturing the point where impotent hopelessness – “This is just drug town, just zombies, but that’s just life … the school just looks like a shithole” – collapses into cynicism: “They’re gonna put a Wal-Mart here,” it concludes, in a rousing massed chorus. A Line in the Sand, meanwhile, is flatly terrifying. This time the voice is of a worker in a refugee camp, detailing the horrors he’s seen – refugees murdering each other over air-dropped food, “a displaced family eating a cold horse’s hoof” – the whole thing somehow rendered bleaker still by the fact that Harvey sings his words to a jaunty, skipping melody, in a blithe, high-pitched voice.  The Hope Six Demolition Project is full of moments like that, where the experiment unequivocally works, to pretty devastating effect. Even when it doesn’t – when the words seem a little hollow or heavy-handed, attended by a distinct hint of think-about-it-yeah? – it’s still a hugely enjoyable album, potent-sounding, stuffed with tunes great enough to drown out the occasional lyrical shortcomings. By anybody else’s standards, it would be a triumph, but it’s hard to escape the feeling that Harvey was after something more than a hugely enjoyable, potent-sounding album stuffed with great tunes – in which case, she’ll have to settle for a qualified success.
A few unconvincing moments aside, Polly Harvey’s latest is a raucous and powerful set of highly memorable songs