Jamelia, Fatboy Slim and The Kooks will perform in a specially-converted Oxfam shop in London as part of a festival organised by the charity in October.
The stars have signed up for Oxjam, which aims to raise £1 million to help tackle poverty around the world.
Music memorabilia will be sold during the day at the shop - its precise location has not yet been confirmed - and it will host the gigs at night.
The Chemical Brothers and Jarvis Cocker have designed badges for the campaign.
The Kooks will perform an acoustic set on Monday, 1 October, with Cocker also on the bill as a DJ that evening.
Jamelia and Killa Kela have been confirmed for the following day, while Hot Chip and DJ Bobby Friction will appear on Wednesday of that week.
Fatboy Slim - real name Norman Cook - and Emmanuel Jal round off the live sets on Thursday, 4 October.
Cook said he had always donated his unwanted records to Oxfam but performing in one of its charity shops "will be a first", and promised "a few choice tunes".
For the Kooks, singer Luke Pritchard praised the campaign, saying it was all about "thousands of small events adding up to something much bigger" to make a difference.
Oxfam said its target of £1 million would fund the provision of drinking water for almost 1.4 million people, or 20,000 emergency shelters, or medicine to treat 10,000 people.
Its month-long festival is expected to involve about 40,000 musicians in 3,000 different events.
These will include a simultaneous 12-hour "buskathon" in about a dozen British cities and a travelling guitar, which will be taken from John O'Groats to Land's End throughout October and will be used at a different Oxjam show each day.
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