The dates are gen<answer>era</answer>lizations, since the periods and <answer>era</answer>s overlap and the categories are somewhat arbitrary, to the point that some authorities reverse terminologies and refer to a common practice "<answer>era</answer>" comprising baroque, classical, and romantic "periods". For example, the use of counterpoint and fugue, which is considered characteristic of the Baroque <answer>era</answer> (or period), was continued by Haydn, who is classified as typical of the Classical <answer>era</answer>. Beethoven, who is often described as a founder of the Romantic <answer>era</answer>, and Brahms, who is classified as Romantic, also used counterpoint and fugue, but other characteristics of their music define their <answer>era</answer>.
Some authorities reverse terminologies to refer to the common practice period as a what?
era