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Basso continuo, though an essential structural and identifying element of the Baroque period, rapidly declined in the classical period (up to around 1800).[1] A late example is C. P. E. Bach's Concerto in D minor for flute, strings and basso continuo (1747). Examples of its use in the 19th century are rarer, but they do exist: masses by Anton Bruckner, Beethoven, and Franz Schubert, for example, have a basso continuo part that was for an organist.[citation needed]