The first acts for the VISA London 2012 Party in The Mall on 24 August were announced today.
The acts announced were The Feeling, Il Divo, Katherine Jenkins and McFly.
There will be more acts announced in the coming weeks, including collaborations and specially-arranged performances.
40,000 people will gather in front of Buckingham Palace to watch the show, celebrating the Handover of the Olympic Games from Beijing to London. Tickets for the Mall party have already been allocated via a ballot, which was over-subscribed.
It will also be broadcast live on BBC One and BBC Radio 2 and on giant screens around the UK.
McFly said: 'Witnessing the Games come to London and playing not only in the Mall but to the country as a whole is a once in a lifetime opportunity.'
Il Divo said: 'We are delighted to be part of such a historic event; performing in the shadow of Buckingham Palace in front of an audience of millions. It's an honour to be associated with the Olympics in such austere surroundings.'
Colin Grannell, Executive Vice-President, Partnership Marketing at Visa Europe, said: 'As a global supporter of the Olympic Games for more than two decades we at Visa are proud to sponsor an historic and memorable event for people to celebrate the return of the Games to London after sixty years.'
Read more about plans to celebrate the Handover of the Olympic Games to London