We talked to one of those involved in the Live 8 project - the writer Richard Curtis - whose credits include Notting Hill and Love Actually
All-star line-up
The free Live 8 will be held in London's Hyde Park on 2 July with concerts in Philadelphia, Paris, Rome and Berlin.
Madonna and Sir Paul McCartney are among stars playing in London while Stevie Wonder is on the US line-up.
A text message lottery is being held on 6 June to determine who will gain tickets to the UK concert.
Listeners to breakfast shows on BBC and commercial radio stations will be asked to send a text message at 0800 BST containing the answer to a multiple choice question. The winners will get two tickets to the show.
It will also be shown on big screens in seven cities across the UK, and shown live on BBC TV and radio.
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