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If you play piano you immediately see what notes construct what chord. For example you see on your keyboard that C Major is constructed of C E G. It's much harder to visual that on guitar even if you know fretboard well.

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How important is it to you to be the best musician in the room? Do you think being a better musician will help you earn more money? It could not hurt. Learn all the notes on the entire fretboard. –  Wheat Williams Apr 25 '12 at 3:02
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@WheatWilliams who says he aspires to play for money? An issue is, the question doesn't say what aspirations he has. –  slim Apr 26 '12 at 15:26
    
Yes, slim, my intention was to ask him what aspirations he has. The answer depends on that. –  Wheat Williams Apr 26 '12 at 19:29
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4 Answers

up vote 8 down vote accepted

It's fairly important unless you're going to play via shapes and/or patterns. You can get away with it for a long time; I did, for the first 4 or 5 years of playing. As soon as someone asked you to play something for which you don't have a ready shape or pattern you're in trouble.

In my opinion, at a minimum you should know how to build simple chords on the fly:

  • Major Chord: First Third and Fifth from the appropriate major scale. (in C: C, E, G)
  • Minor Chord: First Third lowered a half step and Fifth (in C: C, Eb, G)

etc...

I would also learn how to use the Nashville Number System, developed in the late 1950s and still in use by studio, stage and touring musicians in the music industry in Nashville, Tennessee and elsewhere.

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What is the Nashville system? –  Dr Mayhem Apr 24 '12 at 10:15
    
@DrMayhem music.stackexchange.com/questions/1480/… -- in short, use roman numerals to denote the root chord (I) and relative chords. e.g. if C is the root, I is C maj, IV is F. –  slim Apr 24 '12 at 11:28
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Ahhh - I guess I could have just googled that, eh. Didn't realise it had a name. Thanks. –  Dr Mayhem Apr 24 '12 at 15:46
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@JoshFields: Josh, I've been given "chord sheets" in several contexts from completely informal (here are the chords for "x") to the recording studio (here's my arrangement, we do this in the key of "x"). However my studio experience is limited to the early/mid 80s so YMMV. –  JimR Apr 25 '12 at 18:22
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@JoshFields I've marked up sheets for my band using roman numerals. It means I don't have to decide on a key, and we can choose one as we play. –  slim Apr 26 '12 at 15:25
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I'd just like to say (quite seriously),

One of the many ways of becoming a better guitarist, is to know the notes which make up a chord

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This depends entirely on your aspirations. Different people think about music in different ways, and you need to find your own preferences.

If you're happy to strum or pick chords by learning shapes, then it's OK to just learn the shapes and play them without thinking about the rhyme or reason. It's definitely worth knowing which string is the root note of each chord shape, because a strum often sounds better if you start on the root, and the root note is the basis of a picked pattern.

From there, it's your choice how smart you want to be. It's never harmful to know more!

Bear in mind that many good classical musicians don't reason about the notes they are playing -- they just play what's written on the stave. It's not a learning style that works for me; but it works for many.

If you know the names of which notes you're playing, you can reason about how the chords are constructed. This makes it easier to remember the shapes because they are no longer just random clusters of dots to you; you can see patterns in how they're arranged.

There are two ways to look at this:

  • you can think of each fret position on each string as an absolute note. So a 6-string C major chord is made up of G, C (root), E, G, C, E.
  • you can think of notes relative to one another. So that C chord is r0+4, r1, r1+2, r1+4, r2, r2+2 (where r0,r1,r2 are octaves of the root note)

It's great to be able to do both of these, but you're likely to find that you're more comfortable with one and will have to work harder on the other. Which one it is, depends on you.

Then there's the opposite direction -- where you know what notes make a chord, and are able to construct a shape from that. This allows you to create your own inversions higher up the fretboard, rather than learning them all by rote.

Using a combination of all of the above, you can modify chords you know, to create new chords. For example:

  • You know a shape for A major
  • You want to play an A major 7th
  • You know that it needs to include a G# -- or, if you think in a more relative way, you know it needs to contain a note that's a semitone below the root
  • You can find a G# that can be fretted by adapting the chord you know.

So yes, it's very useful. But, if your ambitions are low, you don't need it.

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JimR gave you a good answer, I'd like to add my $.02 to that by mentioning that it'll depend on what you're playing and who you're playing with. For a long time I played in a choir's backing band, and we were mostly given sheet music matching the choir's arrangement. It was not uncommon to encounter chord progressions with 6s, 9s, flats and sharps, or with a non-root note in the bass. Knowing how to build chords made life easier for me since I could use it to figure out a guitar part that would have the right chords and fit with what the others where doing, as in this case "the others" meant both a bass and a keyboard player as well as a choir.

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