Florence And The Machine play with 30-piece Welsh choir at Radio 1’s Big Weekend 2010

Plus Prince William is on hand to check out Ellie Goulding's set at Bangor event

Florence And The Machine headlined Radio 1’s Big Weekend backed by a 30-piece Welsh choir tonight (May 22).

Topping the bill on the first of the radio station’s two nights at the Vaynol Estate in Bangor, Wales, Florence Welch led her band, and backing singers, through their first festival headline slot, playing tracks from debut album ‘Lungs’ including ‘You’ve Got The Love’, ‘Dog Days Are Over’ and ‘Kiss With A Fist’.

Earlier in the evening, Dizzee Rascal had played a set that included new song ‘Heavy’, along with his trio of chart-toppers – ‘Bonkers’, ‘Holiday’ and ‘Dance Wiv Me’. Meanwhile, MGMT were also given a good reaction by the 20,000 strong crowd. Among revellers was Prince William, who along with his girlfriend Kate Middleton checked out Ellie Goulding‘s set on the In New Music We Trust Stage.

Scouting for Girls kicked off proceedings on the Main Stage at 1pm (BST), before 30 Seconds To Mars got the crowd moving with an energetic gig. US teen singer Justin Bieber received a mixed reception during his 10-minute set, with cheers from fans at the front of the stage and boos at the back of the tent.

Meanwhile, Girls Aloud singer Cheryl Cole drew one of the largest crowds of the day to the Main Stage for a set that included a cover of Owl City‘s ‘Fireflies’ plus her own hit single ‘Fight For This Love’. Welsh rockers Lostprophets were later treated to a heroes reception, playing the likes of ‘It’s Not The End Of The World’ and ‘Burn Burn’ amidst big smoke explosions.

The second day of Radio 1’s Big Weekend takes place tomorrow (May 23), with Pendulum and Vampire Weekend due to headline.

Rihanna, Biffy Clyro, Paramore, Plan B and Crystal Castles are also on the bill.

Keeping checking NME.COM for more reports from Radio 1’s Big Weekend.