page_title: Transposition (music)
section_title: Sight transposition
hierarchical_section_title: Transposition (music) / Sight transposition
caption_attribution_description: English: This is an excerpt of the trumpet part of Dvorak 9 (New World), which shows that the trumpet has to transpose between E flat and E (mutare).
context_page_description: In music, transposition refers to the process or operation of moving a collection of notes up or down in pitch by a constant interval.
  The shifting of a melody, a harmonic progression or an entire musical piece to another key, while maintaining the same tone structure, i.e. the same succession of whole tones and semitones and remaining melodic intervals.
  — Musikalisches Lexicon, 879, Heinrich Christoph Koch
  For example, one might transpose an entire piece of music into another key. Similarly, one might transpose a tone row or an unordered collection of pitches such as a chord so that it begins on another pitch.
  The transposition of a set A by n semitones is designated by Tₙ, representing the addition of an integer n to each of the pitch class integers of the set A. Thus the set consisting of 0–1–2 transposed by 5 semitones is 5–6–7 since 0 + 5 = 5, 1 + 5 = 6, and {{nowrap|2 + 5 = 7}.
context_section_description: Although transpositions are usually written out, musicians are occasionally asked to transpose music "at sight", that is, to read the music in one key while playing in another. Musicians who play transposing instruments sometimes have to do this (for example when encountering an unusual transposition, such as clarinet in C), as well as singers' accompanists, since singers sometimes request a different key than the one printed in the music to better fit their vocal range (although many, but not all, songs are printed in editions for high, medium, and low voice).
  There are three basic techniques for teaching sight transposition: interval, clef, and numbers.
caption: Excerpt of the trumpet part of Symphony No. 9 of Antonín Dvořák, where sight transposition is required.
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