Modulation: How To Find First Degree Relationship Keys

What are First Degree Relationship Keys?
First Degree keys are those that are closely related to the original key. The science of harmony makes thes keys the most natural keys to modulate to!

How many First Degree Relationship Keys are there for any given key?
Each Major and minor key has six First Degree Relationship Keys they can to modulate to.

How do you find First Degree Relationship keys?
1) Parallel Major or minor key, i.e. no difference in key signature
2) Major key with one sharp difference
3) minor key with one sharp difference
4) Major key with one flat difference
5) minor key with one flat difference
6) In a Major key - the Harmonic Subdominant built on IV scale degree; In a minor key - the Harmonic Dominant built on V. These keys have a difference of 4 key signatures. (What are Harmonic Subdominants/Dominants?)

For example, let's take simply take the key of C Major.

First Degree Relationship Keys of C Major
1) a minor - 0
2) G Major - 1#
3) e minor - 1#
4) F Major - 1b
5) d minor - 1b
6) f minor - 4b

To find First Degree Relationship Keys of a minor key, the process is exactly the same as above except when finding the key with 4 key signantures difference, it will be based on the fifth scale degree (instead of fourth).

Let's take a minor for instance:
1) C Major - 0
2) G Major - 1#
3) e minor - 1#
4) F Major - 1b
5) d minor - 1b
6) E Major - 4#

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