SEATTLE - Down the hall in Matt Shim's UW dorm room, the freshman has a visitor. He's Hollywood composer Matt Messina.

The two Matts are collaborating on the two songs they wrote and together:

"He wrote the lyrics," says Matt Messina referring to the 18-year-old musician. They'll perform those songs Friday night at Benaroya Hall at a benefit concert for Children's Hospital.

Matt Messina has been producing and composing the symphonies the last nine years. It was his idea, and he got the idea when he visited a friend's daughter at Children's Hospital.

After she died of brain cancer, his friend told him: "Children's Hospital made the last year of my daughter's life amazing."

Matt decided to volunteer at the hospital, playing the piano and singing in the playroom. Now, through the Sapristi Guild, he produces "Symphony Seattle". He volunteers his time and talents.

Over the years, he's realized that so many of the kids recovering at Children's Hospital are very talented. Last year, Matt brought 19-year-old Amy Ogmundson to the stage.

"She was amazing," says Messina. And she was. I was in the audience. Her voice was absolutely sublime; her music, riveting.

She collaborated with Matt Messina to perform the songs "Weathering the Storms" and "This is my Getaway".

This year, it's Matt Shim's turn. He will perform the songs "Tomorrow" and "What Comes Now?"

Matt spent nine months at Children's Hospital after he was diagnosed with Leukemia. It happened in his junior year at Bothell High School. Now as a freshman at the UW, Matt's cancer is in remission.

Matt Messina and the Sapristi Guild have set a goal to become a $100,000 annual fundraiser by the year 2007. For more information about the Sapristi Guild and Friday night's concert at Benaroya Hall, please visit www.sapristiguild.org