It's called "The Hootennanny for a Healthy Gulf", bringing together Seattle artists from different bands, and different genres, for one common cause. I was lucky enough to go behind the scenes, and see how this uniquely Seattle event came to be.

It's a gathering of friends. Casual and relaxed, on the stage of the Moore Theatre.

"That's where we came up with this", says Seattle bassist Jeff Rouse, who plays in Duff McKagan's band, "Loaded". "Let's, make it like a living room, and kinda make it feel like they're right there."

Technically, the Hootenanny for a Healthy Gulf began in the basement of Jeff and Debra Heesch's home in Seattle. "It started because they basically come over to my house or go over to ( Pearl Jam guitarist Mike) McCready's, and they just play music," Debra Heesch says. "It's an amazing experience to watch them do this so we thought, why don't we do it for other people?"

In February, that's exactly what they did. The "Hootenanny for Haiti" brought together legendary Seattle musicians with devoted fans for a sold out show to raise money for victims of the earthquake.

"It was more spectacular, more spiritual than I realized it was going to be", Mike McCready says.

"You could just see, catching the eyes of audience members, some smiles, some tears, so the whole thing was just a really great connection", says singer/songwriter Kim Virant.

Mark Pickerel, formerly of Screaming Trees was in awe as he was performing.

"I'm looking around the room, and it's this all-star cast of dudes backing me up. I felt like i was on the receiving end of a charitable thing."

Thursday night, they're doing it again. McCready, Guns n' Roses' Duff McKagan, Pete Droge, and more than a dozen others have answered the call for another Hootenanny, this one to benefit the Gulf Restoration Network, dedicated to clean and protect the waters of the Gulf coast.

"Maybe it's because we've all grown up in Seattle and we feel very attuned to the environment is why this cause is special to me right now", McCready says.

Also on stage, you might recognize Edgar Hansen and Matt Bradley, from the hit TV show "The Deadliest Catch". Edgar just returned from the Gulf, where he checked out the devastation firsthand.

"They took us up in the chopper, and it's not a pretty sight. There's a lot of oil left, not just on the water, but down below, whatever they sank. Out of sight, out of mind, maybe, but it's got to come back up sometime."

It's a party with a purpose. One that's come from the basement to the big stage... and it will most definitely be a "hoot".

Tickets for Thursday's show are $20, $25 day of show, and can be purchased online at Tickets.com, and the Seattle Theater Group website, stgevents.org.