In music, Transposition occurs when we take a group of notes and move that group up or down by a certain interval. For example, if we take a C Major chord (the notes C, E, and G) and transpose them up by a Major second we then have a D Major chord (the, notes D, F-sharp, and A).
The step by step process by which we transposed a C Major chord up by a Major second to become a D Major chord is as follows:
- C Major chord: notes C, E, and G
- Move the first note of the C Major chord, C, up by a Major second. We now have the note D.
- Move the second note of the C Major chord, E, up by a Major second. We now have the note F-sharp.
- Move the third note of the C Major chord, G, up by a Major second. We now have the note A.
- The results of transposing C, E, and G up by a Major second becomes: D, F-sharp, and A, which is a D Major chord
- Transpose the note E-flat down by a Major Second.
- Transpose a D7 chord (D, F-sharp, A, C) up by a minor third.
- Transpose a C Major scale (C, D, E, F, G, A, B, C) up by a Perfect fifth.
A Few Words About Transposing Instruments:Transposing instruments are instruments that automatically transpose when playing - the actual pitches they play are different from what is written in the music. For example, the B-flat Trumpet transposes down by a Major second. For a B-flat Trumpet the written note C would actually come out as B-flat.