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Up Next. About Clerestory From countertenor to bass Clerestorys singers have been called distinctive voices blending in a gorgeous sound by SF Classical Voice. Since 2006 the selfled ensemble tells the clear story of ethereal a cappella polyphony from across the centuries. Clerestorys members are veterans of San Franciscos finest professional vocal groups including Chanticleer Philharmonia Baroque American Bach Soloists and others.