ヨハン・マッテゾン
An aria is, according to Johann Mattheson in "Der vollkommene Capellmeister" (Part II, chapter 13, paragraph 10), "correctly described as a well-composed song, which has its own particular key and meter, is usually divided into two parts, and concisely expresses a great affection. Occasionally it closes with a repetition of the first part, occasionally without it."