LilyPond Internals Reference: 2.2.71 Key_performer

### 2.2.71 `Key_performer`

Music types accepted: `key-change-event`

Properties (read)

`instrumentTransposition` (pitch)

  Define the transposition of the instrument. Its value is the pitch that sounds when the instrument plays written middle C. This is used to transpose the MIDI output, and `\quote`s.

`Key_performer` is part of the following context(s) in `\midi`: `DrumStaff`, `GregorianTranscriptionStaff`, `KievanStaff`, `MensuralStaff`, `PetrucciStaff`, `RhythmicStaff`, `Staff`, `TabStaff` and `VaticanaStaff`.

#### LilyPond – Internals Reference v2.24.4 (stable-branch).