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→Harmony in 4ths and 5ths
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{|class="wikitable"
|+ TritoneAugmented 4th
! Open
!colspan=3| Other Fingerings
E-1--3--5--7--8--10-12-13
B-1--3--5--6--8--10-12-13-
P P P tt A4 P P P P
Notice the major scale only contains one tritone or augmented 4th. We refer to it as A4 instead of tt here, because we are using 4ths - in that context it is the A4. I find it's easiest to flatten the index finger and shift positions for each interval, but add the middle or ring finger for the tritoneA4.
Let's try the same thing but using 5ths:
|}
C5 D5 E5 F5 G5 A5 B5 Bd5 C5 E-3--5--7--8--10-12-13--15- B-1--3--5--6--8--10-12--13- P P P P P P tt d5 P
Very similar - only one tritone (or diminished 5th here). Although the interval is identical (the including fingering is ) to the same as A4, we call it a d5 based on the example for 4ths)context. Again, it's easiest to use the index and ring fingers to make the perfect 5th shape and shift positions as you move up the fretboard, switching out the ring finger for the middle finger (or moving the ring finger back a fret) when you reach the tritoned5.
You may notice the 5ths sound rather similar to the 4ths. Remember that 4ths and 5ths are the most harmonious intervals, with ratios of 4:3 and 3:2, respectively.
Those Perfect 5ths are also called ''power chords'', which are a staple of rock and roll music. They might sound a little weird on the 1st and 2nd strings, but try playing around with that shape on the 5th and 6th strings!
E5 G5 A5 B5 C5 D5 E5
A-2--5--7--9--10-12-14-
E-0--3--5--7--8--10-12-
P P P P P P P
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