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RiverOaks Chorus A 501c3 nonprofit organization Home About Us Our Charity Book Us Events Help Our Chorus VisitContact More Welcome. We are a performing and competing all women39s acappella chorus rehearsing weekly in the heart of San Fernando Valley. We work hard and play hard to perfect the artistry of barbershop harmony. Our repertoire is as diverse as our members and we singsongs from broadway to doowop to mainstream popular songs and some barbershop classics as well.