Historically informed performance

Historically informed performance (also referred to as period performance, authentic performance, or HIP) is an approach to the performance of classical music which aims to be faithful to the approach, manner and style of the musical era in which a work was originally conceived.

It is based on two key aspects: the application of the stylistic and technical aspects of performance, known as performance practice; and the use of period instruments which may be reproductions of historical instruments that were in use at the time of the original composition, and which usually have different timbre and temperament from their modern equivalents. A further area of study, that of changing listener expectations, is increasingly under investigation.

Given no sound recordings exist of music before the late 19th century, historically informed performance is largely derived from musicological analysis of texts. Historical treatises, pedagogic tutor books, and concert critiques, as well as additional historical evidence, are all used to gain insight into the performance practice of a historic era. Extant recordings (cylinders, discs, and reproducing piano rolls) from the 1890s onwards have enabled scholars of 19th-century Romanticism to gain a uniquely detailed understanding of this style, although not without significant remaining questions. In all eras, HIP performers will normally use original sources (manuscript or facsimile), or scholarly or urtext editions of a musical score as a basic template, while additionally applying a range of contemporaneous stylistic practices, including rhythmic alterations and ornamentation of many kinds.

Historically informed performance was principally developed in a number of Western countries in the mid to late 20th century, ironically a modernist response to the modernist break with earlier performance traditions. Initially concerned with the performance of Medieval, Renaissance, and Baroque music, HIP now encompasses music from the Classical and Romantic eras. HIP has been a crucial part of the early music revival movement of the 20th and 21st centuries, and has begun to affect the theatrical stage, for instance in the production of Baroque opera, where historically informed approaches to acting and scenery are also used.

Some critics contest the methodology of the HIP movement, contending that its selection of practices and aesthetics are a product of the 20th century and that it is ultimately impossible to know what performances of an earlier time sounded like. The older the style and repertoire, the greater the cultural distance and the increased possibility of misunderstanding the evidence. For this reason, the term "historically informed" is now preferred to "authentic", as it acknowledges the limitations of academic understanding, rather than implying absolute accuracy in recreating historical performance style or a moralising tone.

The choice of musical instruments is an important part of the principle of historically informed performance. Musical instruments have evolved over time, and instruments that were in use in earlier periods of history are often quite different from their modern equivalents. Many other instruments have fallen out of use, having been replaced by newer tools for creating music. For example, prior to the emergence of the modern violin, other bowed stringed instruments such as the rebec or the viol were in common use. The existence of ancient instruments in museum collections has helped musicologists to understand how the different design, tuning and tone of instruments may have affected earlier performance practice.

As well as a research tool, historic instruments have an active role in the practice of historically informed performance. Modern instrumentalists who aim to recreate a historic sound often use modern reproductions of period instruments (and occasionally original instruments) on the basis that this will deliver a musical performance that is thought to be historically faithful to the original work, as the original composer would have heard it. For example, a modern music ensemble staging a performance of music by Johann Sebastian Bach may play reproduction Baroque violins instead of modern instruments in an attempt to create the sound of a 17th-century Baroque orchestra.

This has led to the revival of musical instruments that had entirely fallen out of use, and to a reconsideration of the role and structure of instruments also used in current practice.^{[original research?]}