Chapter 26: Transposing Instruments

Transposing Instruments (The Great Confusion)

This is the biggest shock for new composers. Not all instruments speak the same language.

26.1 Concert Pitch vs. Written Pitch

  • Concert Pitch (C Instruments): When a Piano, Violin, or Flute plays a “C” on the sheet music, the sound that comes out is a real “C”.
  • Transposing Instruments: When a Trumpet player sees a “C” on the page, they blow their instrument, but the sound that comes out is actually a B-flat.

26.2 Why?

It stems from history and mechanics. It allows a player to switch between instruments of different sizes (like Alto Sax and Tenor Sax) without learning new fingerings.

26.3 The Cheat Sheet

If you are writing music for these instruments, you must shift the key on their sheet music:

  1. Bb Instruments (Trumpet, Clarinet, Tenor Sax):
    • They sound Lower than written.
    • Your Job: Write their music a Whole Step HIGHER than the real sound.
    • Example: If the band is in C Major, write the Trumpet part in D Major.
  2. Eb Instruments (Alto Sax, Baritone Sax):
    • They sound a Major 6th Lower than written.
    • Your Job: Write their music a Minor 3rd LOWER (or Major 6th Higher).
  3. F Instruments (French Horn):
    • They sound a Perfect 5th Lower.
    • Your Job: Write their music a Perfect 5th HIGHER.