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Perfect Fifth in Music: Key Relationships
To generalize, any two keys (and their relative major or minor keys) whose tonic notes are an interval of a perfect fifth apart, such as C and G (G is scale degree 5 of the key of C) or F and C (C is scale degree 5 of the key of F) have a close and special relationship.
TABLE 31 Overtones and “Fifth” Relationships
| Tone / Overtone | Multiple ofFundamental | Freq.Ratio | AssociatedScaleDegree | Examples: Tones in Key of ... | ||
|---|---|---|---|---|---|---|
| C | G | F | ||||
| Fundamental | 1 (f) | 1 : 1 | 1 | C | G | F |
| 1st Overtone | f x 2 | 2 : 1 | 1 | C | G | F |
| 2nd Overtone | f x 3 | 3 : 2 | 5 | G | D | C |
| 3rd Overtone | f x 4 | 2 : 1 | 1 | C | G | F |
| 4th Overtone | f x 5 | 5 : 4 | 3 | E | B | A |
| 5th Overtone | f x 6 | 3 : 2 | 5 | G | D | C |