Cornerstone Percussion, a competitive indoor drumline from San Diego, California, was founded in 2010. Indoor percussion combines elements of music performance, marching and theater. The activity is often referred to as percussion theater and the sport of music.
Competitions are held during January-April each year, in addition to multiple opportunities to perform at community events and shows. Winter Guard International (WGI) Percussion Contest Rules dictate that participants are composed of members between ages 14 and 22.
Cornerstone Percussion competes in Independent A Class in Winter Guard International (WGI), Southern California Percussion Alliance (SCPA) and American Drum Line Association (WGASC/ADLA). We are dedicated to giving percussionists an opportunity to perform in an indoor percussion ensemble while still being able to manage academic, work and family responsibilities.