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Filling
in the cracks...the rest of the intervals
If you take any major interval, and lower the top note by a half
step (1 fret) you will have a minor interval.
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C
Db D E F G A B C
1 b2
2 3 4 5 6 7 8
|_| = Minor 2nd (m2)
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C
D Eb E F G A B C
1 2 b3
3 4 5 6 7 8
|___| = Minor 3rd (m3)
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C
D E F G Ab A B C
1
2 3 4 5 b6 6 7 8
|_________| = Minor 6th (m6)
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C
D E F G A Bb B C
1
2 3 4 5 6 b7 7 8
|___________| = Minor 7th (m7)
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If you take any perfect interval and raise the top note by a
half step, then you have augmented interval. If you lower it by
a half step, you have a diminished interval. So if you raise the
top note of a perfect 4th interval, you have an augmented 4th.
If you lower a perfect 5th interval, you have diminished 5th.
These are really just 2 ways to spell the same interval. These
2 intervals are enharmonic. That means that they
are spelled different, but sound the same. There is a generic
name for this interval regardless of how it is spelled, it is
called a tritone.
Tritone
(tt)
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C
D E F F# G A B C
1 2 3 4 #4
5 6 7 8
|________| = Augmented 4th (+4)
The + stands for augmented.
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C
D E F Gb G A B C
1 2 3 4 b5
5 6 7 8
|________| = Diminished 5th (o5)
The o stands for diminished.
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Page 2, playing the intervals of a major scale on the bass
Page 4, Intervals and understanding
the fretboard 
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