Original sentence: The Platinum Sound and Emerald Guard is the marching band, which competes in the 1A class of the Western Band Association circuit
Edited sentence: Although going through numerous director changes the past 5 years, the band has managed to stay a tight family unit and not let anything bring them down.Competing in the class of 1A in the Western Band Association circuit, the PSEG went on this year (2010-2011) to be undefeated in all 4 competitions they competed in.The CHS Platinum Sound and Emerald Guard it the marching band.The CHS Wind Ensemble participated in two festivals (Lakeside High School, SDSU), this year where they got one unanimous superior, and was invited to Southern California band regionals, where they received their second unanimous superior