Two members of controversial 'drill rap' group OneFour have been jailed after bashing three men in a pokie room with a hammer and a chair leg.

Pio Misa, known as Youngest Player or just YP, was jailed for four years on Wednesday at the Sydney District Court.

Dahcell Ramos, who goes by the rap name celly14, was jailed for 10 years.

In the early hours of July 21 last year, Misa and Ramos were at the Carousel Inn in Rooty Hill when they viciously assaulted Anthony Hayward, Tony Taylor and Shayne Turner.

Is this the end of OneFour? Two members of the western Sydney rap group (pictured above) have been jailed over a vicious assault in a pokie room

Pio Misa (pictured), known as Youngest Player or just YP, was jailed for four years

One of the men was so beaten so severely he was left unconscious on the floor and covered in blood.

Misa had hidden a wooden chair leg inside his clothes and used it to hit Mr Hayward twice in the back of the head, the court heard.

Mr Hayward backed away after the first attack.

'Misa then followed him into the middle of the brawl and he hit him for a third time with the timber chair leg,' Judge James Bennett said, The Daily Telegraph reported.

Ramos then struck Mr Taylor repeatedly in the head with a hammer.

'Ramos pulled out a hammer from inside his jacket and hit the victim Taylor in the head a number of times,' the judge said.

After the vicious assault the rappers ran from the pub but were arrested later that night.

Misa is to serve a minimum of two years behind bars and Ramos must serve at least six.

OneFour shares its name with a Mount Druitt youth gang but insist they are not members themselves, and say the name comes from the year they were established.

Misa (centre) had hidden a wooden chair leg inside his clothes and used it to hit a man inside a pokies room

The rap group (members pictured above) apologised to their fans and said jailed member YP understood that the 'show must go on'

WHAT IS DRILL MUSIC? 'Drill' music, a hip-hop subgenre, is driving feuding gang wars in Britain, community leaders have warned. Hundreds of videos on YouTube feature UK rappers threatening and provoking people from rival areas in London. To 'drill' means to fight or scrap and the violent lyrics focus on gang life, drugs, guns and killing. In one video viewed nearly three million times, rapper Digga D boasts about having to bleach his knife after using it to attack someone. In another, entitled 'Mummy's Kitchen', rappers Loski and Mayski, who are thought to be Londoners, boast about taking a blade from the family home. In the videos, which are filmed across the city, performers take care to ensure their faces are covered. In Australia the genre has been adopted by rap group OneFour, from Sydney's west. Advertisement

The rap group took to Instagram to apologise to their fans.

'Just when we thought we were doing okay, we hit another obstacle,' they wrote.

'This tour was solely to celebrate the success of OneFour and also give YP the opportunity to perform one last time.

'Unfortunately due to the shows being cancelled and bail conditions restricting YP from leaving the country, today he has been sentenced.

'We know YP would of loved to perform for everyone and he appreciates all the love and support you send him. As an artist he understands that the show must go on regardless.'

The group also revealed that another member of their rap group had been denied entrance to New Zealand, but insisted their Auckland concert would still go on.

The artists perform drill rap, a hardcore version of hip hop that moved from Chicago to the UK, that has come under fire from UK police for inciting violence.

They have developed a cult following online, with singles Shanks and Shivs, The Message and Spot the Difference racking up millions of views on YouTube.

In some songs the rappers talk about stabbing people and putting them in coffins.