The trio of (top photo, from left) Glenn Renfro, Mike Stroup, and Annie Rost perform at the Schulenburg Public Library on Tuesday, June 16 as part of the Summer Reading Program, which has a theme of “Unearth A Story” this year. In addition to entertaining the audience with a variety of songs, they explained the science of sound and how vibrations generate the sound waves we hear. Renfro showed how…