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How do recitative and aria differ in opera and oratorio?

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Educational diagram showing the human voice-producing apparatus, including a side view of the head and neck with labeled tongue, larynx, vocal cords, and trachea, plus a top-down view of the vocal cords during inhalation and sound production. Labels explain the roles of resonators, vocal cord positioning, and cartilage structures in speech. — vocal music The parts of human anatomy that produce vocal sound.

In opera and oratorio, recitative and aria serve distinct structural and dramatic purposes.

Recitative

Recitative is a style of vocal music that mimics the rhythms and accents of spoken language. Its primary function is to carry dialogue and advance the plot or narrative. It is generally categorized into two types:
* Recitativo secco: "Dry" recitative with a free rhythm and simple, chordal accompaniment, often using only a few pitches to approximate speech.1
* Recitativo stromentato: Accompanied recitative that features a stricter rhythm and more involved orchestral support, often used for heightened emotional moments.1

Aria

An aria is a solo song with instrumental accompaniment. Unlike the plot-driven recitative, arias are dramatically static. They allow characters to pause the action to reflect upon the preceding events or express internal emotions. While recitative emphasizes speech-like delivery, the aria focuses on melody and musical form, such as the historically significant da capo aria.21