Harmonizing in 3rds
The illustration below shows how to play two notes together in the key of C major and in Am. The two notes will be played as 3rds. The key of C major has 7 notes, C, D, E, F, G, A, B and C. The chords of C major are, C, Dm, Em, F, G, Am and B dim. Recall that all triads are built upward in thirds. For example the C chord uses the 1st, 3rd and 5th C, E and G. So you have 3 major chords in the key of C and three minor chords. The diminished chord has the notes B, D, and F. You will be using the minor third for this note as well.
It is possible to harmonize each note together as illustrated. Each note below uses the 1st and 3rd of each chord. So you can harmonize these two notes of each chord.
You can also harmonize the same way in Am. The notes of the Am scale are. A B C D E F G.
Don't let this illustration fool you. It is very easy and highly recommended to practice. As you practice, you will begin to hear familiar songs. You will also begin to come up with great songs of your own.
To simplify things, the notes illustrated are minor and major thirds. We all know that the major chords are 1, 3, 5 and minor chords are 1 b3 and 5.
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