| http://www.w3.org/ns/prov#value | - According to the official Carl Ziehrer Web site, ziehrer.at, and the Web site of the Johann Strauss Society of Great Britain, johann-strauss.org.uk, his compositional output of 566 opus numbers includes 22 operas and operettas, about 70 marches, and almost 500 waltzes, polkas, and other dances.
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