Intro, Transition and Outro

An intro introduces one element, a transition changes one parameter, an outro resolves once.

Related

OvertureCodaPreludeBaroque

An intro, a transition and an outro each do one job. The intro builds expectation, the transition changes one parameter, and the outro resolves or refuses to resolve. Fill all three with material and the sections lose their direction.

The problem

An intro that shows every idea at once, a transition that relies on a drum fill, and an outro that simply stops all leave listeners aware of a change without understanding it.

Texture or frequency band

Intros often withhold low or high frequencies to create incompleteness. Transitions point forward with a rising bass, a suspended chord or a change of density. Outros hold one sustained tone and let the harmony fade, or close with a firm cadence.

Approach

Let the intro introduce one element, whether rhythm, timbre or motif. Let the transition change one parameter, whether register, harmony or density. Let the outro resolve once. If a transition feels stiff, check whether the bass arrives in the new key too early. If an outro feels short, extend its duration rather than its volume.

What to listen for

Hear the dotted slow opening of Bach's French Overture BWV 831 turn into a fast section. Hear the Promenade from Pictures at an Exhibition link the movements. Then hear the coda of the Alla turca close the theme.

Common misunderstandings

A longer intro is not automatically more impressive, and a short one often grabs attention faster. An outro is not the same as a fade, since a firm ending works just as well.

Sources

• The New Grove Dictionary of Music and Musicians, 2nd ed., entry Overture（Oxford University Press），用于核对引子与过渡的功能
• The New Grove Dictionary of Music and Musicians, 2nd ed., entry Coda（Oxford University Press），用于核对尾奏的收束方式

Used for fact-checking only; all prose is original.