Party at the Park

I know yesterday there was a big concert with lots of artists in Hyde Park. They broadcast it on the Italian radio, but I just listened to The Calling, Mc Fly, and Avril Lavigne, because then I had to go to play at a party with my group.
Can you just tell me who were the other artists and if there were some interesting? In case there were, do you have a recording?

You not thinking of T In The Park in Scotland?

No, I'm sure it was in London, Hyde Park.
The Italian radio said the event was organized by Capital Radio and it was live.
I was only wondering which other artists took part at the event.