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Transposing songs from one Key to another
The Key of any melody on a staff can be changed to any other Key by raising or lowering all the notes involved by the same number of half-steps. Let us transpose Twinkle Twinkle Little Star from the Key of C Major to the Key of G Major. We will transpose the song up 7 half-steps to G Major from C Major (we could also transpose the song 5 half-steps down to G Major from C Major). Every note in our melody must be moved seven half-steps higher than we saw in C Major. We can transpose note by note or by using the scale degrees of our Major Key. In any Major Key, the scale degrees are built from the tonic note. Therefore, the easiest manner to transpose is to use the scale degrees.
Here is Twinkle Twinkle Little Star in C Major with scale degrees.
scale degrees 1st 2nd 3rd 4th 5th 6th 7th
C Major C D E F G A B
G Major G A B C D E F♯
chords
C Major C Dm Em F G Am Bo
G Major G Am Bm C D Em F♯o
Now we can work on our melody in the Key of G Major. From the previous staves: all C notes become G notes, all D notes become A notes, all E notes become B notes, all F notes become C notes, all G notes become D notes, all A notes become E notes, and all B notes become F♯ notes. In G Major, our I-IV-V7 chords are G Major, C Major and D7. The G Major arrangement is identical in the relationship between the tonic note of the Key and the melody as the C Major arrangement is.
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