The musicians donate tracks in aid of climate change and funds for disaster relief organisation
Cee-Lo to record film song?
Cee-Lo Green is rumoured to be recording the theme song to the film 'Arthur' which stars Russell Brand and Helen Mirren.
Cee Lo has been signed up to cover 'Arthur's Theme (Best That You Can Get)' according to one of the film's stars.
Greta Gerwig told MTV : 'I think Cee Lo might be doing something with it- I'm not kidding! I met him at a screening the other day.'
She added: 'We were thinking Gwyneth Paltrow too!' hinting that it may be a duet between the two.
Bruno Mars, JLS, Olly Murs, The Wanted, Cover Drive, Jessie J and Enrique Iglesias are just some of the stars to post messages on Twitter. Read them here.
The boys will be joined by Cee-Lo Green, Christina Aguilera and members of the Jackson family.
Cee-Lo Green and Amy Winehouse had plans to record a song together.