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== Example ==
Let's say our goal is to play a I - IV - V - I progression in Ab A{{flat}} Major. On other instruments, it may be necessary to know what the 4th and 5th of Ab is, and to know what notes compose each of the chords involved. On guitar, we only need to know where to find those root notes on the fretboard and which shapes to play.
e--------------
Here are the root notes. We can figure out where these notes occur quickly:
# We know that the open A string pitch is equal to the 5th fret of the low E string. Ab A{{f}} is just one half-step or fret below.# We know that the guitar is tuned to 4ths on all but the G and B strings. Thus, the note a P4 interval above our current note is simply the same fret on the next higher-pitched string. The root of the IV chord is A string, 4th fret DbD{{f}}.# We know that the 5th is just a whole step, or two frets, above the 4th. The root of the V chord is A string, 6th fret EbE{{f}}.
I - IV - V - I consists of all major chords. Let's simply apply the shapes above to our root notes:
e--4--------4--
Now let's say we want to change the key to Bb B{{f}} major. We know that Bb B{{f}} is one whole step above AbA{{f}}, so we can move the entire progression above two frets higher, and that's all there is to it:
Bb Eb F Bb