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== Why/When to Use Modes? ==
Here we have a standard I - IV - V - I progression in C Major. The C major scale = C Ionian. This has the B - C leading tone, as well as the P5 G, solidly establishing the tonality of C. We start on C Ionian over the C major chord to root the piece in C Major. When the F major chord occurs, we switch to C Mixolydian. F consists of the P4, M6, and M2 notes from C Major. Mixolydian shares all the notes of C Major with the exception of the M7. C Mixolydian has a {{f}}7. While this doesn't create any severe dissonance with the chord, it certainly shakes up the tonality a little bit. Similarly, over G Major we use C Lydian, which shares all the same notes as C Major except it has an A4 instead of P5. C Lydian is actually equivalent to G Major. It feels like a modulation to G, but then when we return to the C Major chord in the harmony, we revert back to C Ionian.
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== Pitch Axis Theory ==
This approach really emphasizes the changes in how the root note is approached and how it interacts with the other notes. It can feel almost like a random modulation, but the common root note ties it together and makes for quite adventurous progressions and melodies.
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== Homework ==
* [[Music Theory - Minor Keys]]
* [[Circle of Fifths]]
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{{Advanced Lesson Crumbs|4}}
[[Category:Guitar]]