Tidal Live Stream Features Slew of A-List Artists, Including Madonna Straddling a Table

Madonna onstage at the Tidal launch event #TIDALforALL
Jamie McCarthy/Getty Images for Roc Nation

Madonna onstage at the Tidal launch event #TIDALforALL at Skylight at Moynihan Station on March 30, 2015 in New York City. 

After a big countdown and star-studded teaser, Alicia Keys emceed an all-star livestreamed announcement about Tidal -- the high-quality music streaming service Jay Z recently purchased -- on Monday (March 30).

"Our mission goes beyond commerce and technology," Keys promised. "Our intent is to preserve music's importance in our lives. It's the world's true universal language."

Jay Z's Tidal Teaser Clip Features Madonna, Taylor Swift, Beyonce & More

Tidal features the following A-list stakeholders: Jay ZMadonna, Taylor Swift, Beyonce, Kanye West, Jason Aldean, Daft Punk, Rihanna, Colplday's Chris Martin, Usher, Nicki Minaj, Jack WhiteCalvin Harris, Arcade Fire's Win Butler and Regine Chassagne, deadmau5, J. Cole and Alicia Keys.

Either in person or via video chat, all of those artists participated in the livestream. Those present at the New York event made a ceremony out of signing a declaration of their intentions to boost this artist-owned music streaming service on the livestream.

To the sound of Radiohead's "National Anthem," the collection of singers, rockers, DJs and rappers signed a piece of paper, one after another. Madonna made a point to straddle the table. Because... Madonna.