'We Are The World' Group Breaks Into 'Lean On Me' Sing-Along

'It was a beautiful moment,' Musiq Soulchild says of Celine Dion-led jam session.

When you get some of the music world's biggest names into one room, a sing-along is bound to happen. That's what went down when an 80-celeb-strong group gathered to re-record the 1985 charity single "We Are the World" for Haitian earthquake relief on Monday.

"I was standing there, and an artist, Melanie Fiona, she was leaning on me — literally leaning on me — and I said, 'This is "We Are the World," not "Lean on Me"!' And then [artist id="1060"]Celine Dion[/artist] just started going on, actually," [artist id="1111145"]Musiq Soulchild[/artist] told MTV News of how the impromptu "Lean on Me" sing-along kicked off. "Everybody started chiming in. It was very organic and not planned at all, and I kind of, like, huddled back, like, 'What just started?' "

Fiona said she had gotten a little restless after the marathon recording session. "We were standing for quite a while, and my feet started to hurt a little bit," she said. "So I said [to Musiq], 'I'm just going to lean on you,' and he said, 'This isn't "Lean on me," ' " she recalled. "And then Celine started singing, and the rest of what you saw is on camera, history."

Soulchild apologized to anyone who thought the sing-along was out of place. "It was a beautiful moment," he said. "It was wonderful, and I apologize if it was inappropriate. My bad. I'm sincere."

Learn more about what you can do to help with earthquake-relief efforts in Haiti, and for more information, see Think MTV. Visit HopeForHaitiNow.org or call (877) 99-HAITI to make a donation now.