Adele and P J Harvey joint favourites as Mercury Prize shortlist announced

Harvey won the award in 2001 but could not attend the ceremony as she was stuck in the US due to the 9/11 attacks

Adele and P J Harvey lead a strong roll call of female artists on this year's Mercury Prize shortlist, which aims to recognise originality and individuality in contemporary British music. A win for Adele would cap a triumphant year which has so far seen the singer-songwriter's album 21 spend 11 weeks at No 1 in Britain and sell more than any other record in the US.

The chairman of the Mercury's judging panel, Simon Frith, said that Adele would "probably be glad still to be thought of as a Mercury artist" – meaning she is still a critical favourite as well as a commercial record-breaker. Adele's soulful, powerful vocals and "gimmick-free" presentation have made her popular with fans, while Harvey, who with Adele is joint favourite to win, has arguably made her best album with Let England Shake, a poetry-inspired mixture of echoing guitars and eclectic cultural influences.

"Women work across all genres, from singing to dance to pop," said Mr Frith. "Trends towards urban music are also reflected across the board."

It is the second time Adele is up for the award. Her debut 19 missed the prize in 2008, when it was won by Elbow, who are also nominated this year for Build a Rocket Boys! Harvey won the award in 2001, but could not attend the ceremony because of the 9/11 terrorist attacks, which occurred on the same day. She had been in New York on the morning of the attacks and had to give her acceptance speech over the phone.

The other female artists on the 12-strong shortlist are Anna Calvi and Katy B. The singer-songwriter Calvi, a 28-year-old classically-trained violinist, has won praise for a self-titled album released earlier this year which was recorded in her parents' basement. Katy B, who was trained at the prestigious Brit School, has been recognised for On a Mission which blends R&B vocals and dub-step arrangements.

The south London "pop rapper" Tinie Tempah is following up his two wins at the Brits with a nomination for Disc-Overy, which won over critics with its wry, self-deprecating wit. Other acts recognised include Everything Everything, James Blake and Metronomy.

Mr Frith added that some of the nominees could suffer from being over-familiar, though he said Adele's 21 was "an astonishing album for many reasons". He also praised Disc-Overy. "I've never played that record to anyone who didn't say 'I want to listen to that again'," added the judge.

The winner will be announced on 6 September.

The nominees: Britain's finest – but who will win?

In a low-key and mostly uninspiring field, Elbow have made the most accomplished and emotionally affecting album, and deserve to repeat their 2008 success, but almost certainly won't. James Blake's debut has the mildly experimental sound and pretty, frail voice to turn the judges' heads.

Adele – 21 Adele is as close as the battered music industry gets to a true new superstar, picked to show the Mercury puts quality first, not cult acts' commercial needs.

Everything Everything – Man Alive The nearest thing to an indie band on this year's list, with a jittery sound replete with fashionable Afrobeat guitars.

Ghostpoet – Peanut Butter Blues & Melancholy Jam Mike Skinner-approved bohemian rapper-poet of apparently stoned verbosity.

Anna Calvi, Anna Calvi Comparisons with Nick Cave were immediate but premature, Calvi lacking the feral nature her fire and brimstone lyrics describe.

Elbow – Build A Rocket Boys! Guy Garvey's much-loved Manchester veterans' bruised optimism and shaggy humanity connect as strongly as ever.

Tinie Tempah – Disc-Overy East London's smart grime chart trailblazer would welcome the Mercury's more mature constituency, though neither really needs the other.

Gwilym Simcock – Good Days At Schloss Elmau Pianist Simcock melodically straddles classical and jazz, fulfilling the unwritten one-jazz-nominee rule.

James Blake – James Blake Blake's glitchy fracturing of his reasonably golden voice attempts digitised bedsit soul, but sounds anaemic.

PJ Harvey – Let England Shake Nominated four times and winning once, Harvey's spare anti-war dispatch has a Booker nominee's gravitas.

Katy B – On A Mission The teenage Peckham dubstep star sings from excited experience of current clubland, making her the entry-level queen of a previously under-ground style.

Metronomy – The English Riviera A sort of sonic concept album, trying to find Fleetwood Mac's decadent spirit in small-town England, by landing yacht-rock in Torquay.

King Creosote & Jon Hopkins – Diamond Mine King Creosote evokes life in the Kingdom of Fife with wispy longing, in a sort of folk album.

Nick Hasted