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There are some very common variations musicians use all the time to keep chords sounding fresh.
Here are a few.
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The added second - D2
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The suspended chord - Dsus
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The major 6 chord - D6
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The major 7 chord - DM7
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The major 9 chord - DM9
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Minor chords will often add a 7th to them.
| This is E minor 7 - Em7 |
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| Here is F# minor 7 - F#m7 |
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| This is B minor 7 - Bm7 |
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V chords often have a 7. In the key of D, the V chord is A, so you would see A7 appearing in the music. Here it is.
The A7 chord
So far, all the changes we've made have added notes that are in the scale. There are other
notes though that are not in the scale. Switching a note in the chord to a non-scale note
gives us an altered chord.
Two very useful altered chords are the iv chord (notice we switched from IV to iv... from
major to minor), and the iim7b5 (pronounced "two minor seven flat five"). In the key of D
the IV chord is G, so the iv chord is G minor.
The iim7b5 is Em7b5. It looks like this.
