Almost all of the works of classical era included vocal parts

False.

Explanation:

Classical music is often distinguished by the wide use it makes of musical instruments of different timbres and tonalities, creating a deep and rich sound. The different movements of classical music were affected mainly by the invention and modification of these instruments over time. Although classical music does not have a "set" of instruments necessary for certain standards of its execution to be fulfilled, composers write their works with different instrumental ensembles in mind. Vocal parts are not a mandatory element, but they can complement bringing more meaning to the work.

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answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;