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Opus One: Berks Chamber Choir is a non-profit community choral ensemble based in Reading, Pennsylvania.
The SATB Choir is Opus One's flagship ensemble. It is composed of 20-25 singers and performs repertoire of various genres, languages, and time periods. The group not only tackles unaccompanied selections but normally features a large work with chamber orchestra. The season for this ensemble runs from August through May and includes four main concerts in addition to run-out performances and other scheduled events. The Opus One Women's Choir is an all female ensemble of about 15-20 singers that runs from June to August. Since 2012, Opus One has performed several large works with orchestra including Schütz's Musikalische Exequien , Vivaldi's Magnificat, Bach's Ihr Tore zu Zion, Handel's Messiah , Haydn's Missa in angustiis, Schubert's Mass in G, Mendelssohn's Te Deum, Vaughan Williams' Magnificat, and Karl Jenkins' The Armed Man: A Mass for Peace . In May 2015, Opus One performed the world premiere of Philadelphia-based composer Heidi Jacobs' Sanctus from her Mass for a Time of War [1] .
Opus One: Berks Chamber Choir is currently under the direction of Christopher Hoster.