More than 100 artists will perform across six stages at BBC Radio 1's Hackney Weekend this Saturday and Sunday (23 and 24 June).
Rihanna, Jay-Z, Ed Sheeran, Jessie J and Kasabian are among the stars who'll perform in front of 100,000 fans who applied for free tickets.
Newsbeat talked to several of the performers including Leona Lewis, Rizzle Kicks, Wretch 32, Lostprophets, Jessie J, Ed Sheeran and Plan B ahead of the event.
The event, held on Hackney Marshes, is part of the London 2012 Festival.
Coverage of Hackney Weekend will be on BBC Three, BBC Radio 1, BBC Radio 1Xtra and online