Ad libitum

Ad libitum (/ædˈlɪbᵻtəm/) is Latin for "at one's pleasure"; it is often shortened to "ad lib" (as an adjective or adverb) or "ad-lib" (as a verb or noun). The roughly synonymous phrase a bene placito ("in accordance with [one's] good pleasure") is less common but, in its Italian form a piacere, entered the musical lingua franca (see below).

The phrase "at liberty" is often associated mnemonically (because of the alliteration of the lib- syllable), although it is not the translation (there is no cognation between libitum and liber). Libido is the etymologically closer cognate known in English.

Music or rhythm

As a direction in sheet music, ad libitum indicates that the performer or conductor has one of a variety of types of discretion with respect to a given passage:

Glossary of musical terminology

This is a list of musical terms that are likely to be encountered in printed scores, music reviews, and program notes. Most of the terms are Italian (see also Italian musical terms used in English), in accordance with the Italian origins of many European musical conventions. Sometimes, the special musical meanings of these phrases differ from the original or current Italian meanings. Most of the other terms are taken from French and German, indicated by "Fre" and "Ger", respectively. Others are from languages such as Portuguese, Latin, Spanish, and Polish.

Unless specified, the terms are Italian or English. The list can never be complete: some terms are common, and others are used only occasionally, and new ones are coined from time to time. Some composers prefer terms from their own language rather than the standard terms listed here.

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