(Update: We've added YouTube videos to this post, and updated the text with new information.)
Big money was spent and a big collaboration was sung on Saturday night at the (RED) auction at Sotheby's in New York City.
The event, a joint effort between Bono and designers Jony Ive (Apple) and Marc Newson, reportedly raised almost $$13 million -- which was apparently then doubled with a donation from Bill Gates. The money will benefit the Global Fund to fight AIDS, Tuberculosis and Malaria in Africa.
But let's talk about the music stuff. Before the auction began, Bono and The Edge took part in a jam session of sorts, performing a cover of Daft Punk's "Get Lucky" with Angelique Kidjo, Nile Rodgers and his band, Chic. (See video 1 and video 2 on Instagram.) UPDATE: This may have been from a soundcheck that included an audience. The tweets with video were clearly sent before the auction itself began, but there's no mention in any of the news coverage of a musical performance before the auction.
Then, during the auction itself, Bono and Chris Martin did a couple of songs on a piano that was being auctioned. With Martin on the piano bench and Bono standing behind, the pair sung a cover of Lou Reed's "Perfect Day" (video) and then did U2's "Beautiful Day." (video) UPDATE: Here are longer videos of these two songs.
Bono and The Edge were back on stage with Kidjo and Rodgers during the afterparty, singing Chic's "Good Times" (video) and perhaps other songs, too. UPDATE: They performed at least one other song, a cover of David Bowie's "Let's Dance." Videos are below.
Oh, one more thing: Guy Oseary, reportedly U2's new manager, was at the auction, too, and tweeted out a photo of Bono and Martin's duet.