There are four band ensembles at Sun Valley (Concert Band, Marching Band, Jazz Band, and Freshmen Percussion), as well as two choir ensembles (Concert Choir and Chamber Choir). The concert ensembles perform two concerts every year, one in the winter and one in the spring. In the spring the two concerts are held separately, while the winter is combined. The later also features the Freshmen Percussion ensemble, featuring developing percussionists. In the winter, the choir holds a fundraising performance entitled
Decades, in which students perform pieces from the 1960s to today. The audition-only Chamber Choir performs at choir concerts and at various other local events. The Sun Valley Marching Vanguards have had unprecedented success for the school at regional competitions, winning six total championships. They won the
TOB Atlantic Coast Championship four times: 1977 (tie), 1979, 1980, and 1981. The band now competes in
Cavalcade of Bands' American division. In the Cavalcade, they have three Open Class championships (2015, 2016 and 2023). The Sun Valley theater department performs a musical every spring. Recent productions include How The Grinch Stole Christmas, A Christmas Carol, The Wizard of Oz, and The Lion King. The department has been recognized several times by the Greater Philadelphia Cappies, a regional award ceremony for high school theater. The school's 2021 production of A Christmas Carol set the school record for most Cappie wins, earning two Cappies off of four nominations. Sydney Lamoureux won the Cappie for Best Comedic Actress in a Musical, and Gianni Palmarini won the Cappie for Best Male Vocalist in a Musical. These are two of the most competitive categories in the Cappies competition. The 2022 production of
How The Grinch Stole Christmas set the school record for most nominations (5), along with one win. The art program at Sun Valley often features student artwork throughout the region, displaying them in local establishments and the district's annual calendar. The school holds an annual art show called
Arts Alive!, which features art from all students enrolled in Sun Valley's various art classes that year. ==Athletics==