With four nominations each, Amy Winehouse and Dizzee Rascal lead the field for the Music of Black Origin (MOBO) Awards, to be held Sept. 19 at London's O2 Arena. BBC1 will broadcast it two days later.

Winehouse is up for best U.K. female, best song for "Rehab" (Island), best video for "Back to Black" and best R&B honors. Rascal is a contender in the categories for best U.K. male, best song and video for "Sirens" (XL), and best hip-hop.

Meanwhile, Akon, P. Diddy, Kanye West, Rihanna and T.I. will go head-to-head for the best international award.

The public is invited to cast votes via the MOBO Web site. Hosting the event will be Shaggy and Jamelia, who were both on hand to unveil the nominations tonight during a party at the Movida club in central London.

Also in the audience was Rihanna, whose recent hit "Umbrella" (Def Jam/Universal) became the United Kingdom's longest-running No. 1 in 13 years with a marathon 10th week stint at the top.

Arranged by the MOBO Organization, the 12th annual MOBO Awards will be the first industry ceremony held at the state-of-the-art Greenwich venue. Owned and operated by the Anschutz Entertainment Group (AEG), the O2 arena opened for business on July 7 on the site of the maligned Millennium Dome.

"British urban music is currently having tremendous success crossing-over into the mainstream," MOBO's organizer Kanya King told Billboard.biz. "We are looking to expand and grow. The move to the O2 is the start of that." For the past three years, the ceremony had called the Royal Albert Hall home.

Shaggy, who is lining up a new album release, "Intoxication" (Big Yard/VP Records) in October, told Billboard.biz backstage that he had just arrived in Britain from hurricane-hit Jamaica. "I was fine. We lost a few branches from our trees at home, that's all."

As previously reported, the MOBO Organization is establishing the MOBO Foundation, which intends to address the problems that people from ethnic-minority communities face when seeking employment or setting up business in the British music industry.