In sixth grade, Doug Piroso asked a local, relatively unknown band for a favor: Play a charity concert at Bow High School as part of his senior project. Since then, the band, Recycled Percussion, has gone on to win national acclaim on America's Got Talent, a prime time television show. When Piroso, 17, called to remind them, they agreed to play a concert Dec. 16 at 6 p.m. to benefit the Capital Region Food Program. Tickets are $20, and will not be sold at the door. They will be on sale at the Bow community building tomorrow from 10 a.m. to 1 p.m. or by contacting Piroso at redsox92dp@aol.com.