The Conversation: 'We Are the World' YouTube Edition

March 19, 2010— -- It's become a YouTube sensation. Fifty-seven singers from around the world, all taking part in an amazing remake of the hit song "We Are the World." Some sing in their bathrooms, others in bedrooms, closets or in offices.

In today's Conversation, Diane Sawyer talks with Lisa Lavie, the woman behind this smash YouTube video. How did she pull off such an incredible project? Who are the singers who have wowed nearly 2 million viewers? Why does Lavie believe this version of the song has become such a hit?

It's a behind-the-scenes Conversation today on an amazing video. Make sure you tune in and then watch "World News With Diane Sawyer" tonight for even more of the video!