As a fleet of cameras zoomed over the crowd eagerly awaiting the second show of John Mayer's new tour at New York City's Beacon Theatre on Tuesday night, a man stepped onstage to explain what was going on. "This is not a TV show, it's a concert," reassured Michael Simon, who was directing a live broadcast for Fuse TV. A concert, he added, "with two small commercial breaks."

Lots of musicians tweet -- but all that Twitters is not gold.

That's why you'll want to check out SPIN.com every Friday to see whose tweets we're reading this week -- then update your TweetDeck! (Obligatory Self-Promotion: …while you're at it, be sure to follow @SPINmagazine!)

This week's winners:

The music world -- and the world at large -- has been mourning Thursday afternoon's unexpected death of Michael Jackson. Via Twitter, Facebook, MySpace, and more, some of music's biggest stars are honoring the King of Pop. Here's what they had to say:

This past Saturday and Sunday (June 28-29), for the Hard Rock Calling festival at London's Hyde Park, Sting, Stewart Copeland, and Andy Summers made their final bow in front of their home country; Eric Clapton proved fans can still put their blind faith in his guitar virtuoso status; and relative rabble rousers like KT Tunstall and Jason Mraz wound their way in between the icons for some ear-ca