By Brandy McDonnellFeatures writerbmcdonnell@oklahoman.comThe sounds of tinkling harps, strumming guitars and chiming vibraphones harmonized with the giggles, squeals and shouts of children Saturday afternoon in Bicentennial Park. No instruments were in sight, with the notes and melodies instead emanating from the towering swing set dominating the lawn in front of the Civic Center.Read more on NewsOK.com