| http://www.w3.org/ns/prov#value | - Opera: Duet for Soprano & Baritone, ballad of baby doe, die zauberfloteballad of baby doe, die zauberflote, die fledermaus: Hi Joe, Well, there are all different kinds of sopranos and baritones, of course, so not all of these suggestions will work for the same two voices.
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