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When we are playing the A major scale, we say we are in the key of A. You can transpose the A major scale scale to any other note (say C, or G) using the pattern of whole and half steps shown on the major scale diagram above. Using this method, you can figure out the C major scale or the G major scale, as shown here:
GABCD EF#G
Look at the pattern of whole and half steps in the two scales above and see that they are the same as that shown in the major scale diagram. Use the chromatic diagram if you need help counting whole and half steps. This method of transposing will allow us to generalize the chord theory learned here to any key and any scale.
Once you know the key of a song you basically know which chords can be used and which cannot. The most important chords in any major key are I, IV, and V (in this case: A, D, and E). Many popular songs use only these three chords.
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