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While I understand that it is very important to include the root note in a chord, is it required?

Let's say I'm in C Major, and I want to play a I chord. Do I need to include C in order for it to be considered a I chord? Or is the chord progression enough to imply that the chord I'm trying to play is a I chord?

Additionally, if I can have such a chord, what is it called, or how is it notated?

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3 Answers 3

up vote 16 down vote accepted

There does exist what we call "rootless" voicings in harmony. These are chords in which the root is implied by the upper harmonies. Typically, the 3rd and the 7th are the primary indicators of chord quality, and the 5th is secondary. Rootless voicings are most commonly used in settings where an instrument such as piano or guitar is providing harmonic support in an ensemble/group setting, and an instrument (usually bass) has already stated the root of the chord. In composition, rootless voicings are utilized to keep the tonal center ambiguous and allow for the possibility of shifting the root of the chord underneath the harmony to create interest. Here are some examples of rootless voicings:

Rootless Voicings

If you were to play the rootless voicings in the above picture without their root, the placement and use of the chord tones would imply the root. Why does this work?

Implied Roots

As I said earlier, the 3rd and 7th give the strongest indicator of the chord quality, and the 5th & 9th are the usual secondary indicators. With that in mind, chord quality can be determined without a root when the following tones exist within the chord:

Major => Maj. 3rd & Maj. 7th

Minor => Min. 3rd & Min. 7th

Minor Major => Min. 3rd & Maj. 7th

Dominant => Maj. 3rd & Min. 7th

Diminished 7 => Min. 3rd, Min. 5th, Dim. (bb) 7

Half Diminished => Min. 3rd, Min. 5th, Min. 7th

Augmented Major => Maj. 3rd, Sharp 5th, Maj. 7th

Augmented Dominant => Maj. 3rd, Sharp 5th, Min. 7th

Experiment with playing these chords & intervals without the root first, and then with the root -- you will become more familiar with the idea of not relying upon the root itself to express the tonal center of the chord. Good luck!

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2  
Some theorists (following Riemann) also view the diminished 7th chord as a dominant-ninth chord with omitted root. Which goes to show that what the root of a chord is is up to the perception of the listener, and it may simply be implied. –  Michael Scott Cuthbert Jul 8 '13 at 0:38
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You may want to update your first paragraph, since yours is now the chosen answer. :) (+1 btw) –  luser droog Jul 10 '13 at 1:18
    
Noted, agreed, and edited. In that order. And thank you :) –  Nate Kimball Jul 10 '13 at 1:37

If some other instrument is playing the root, such as a bass, then that root note is in the chord that's being played by the whole band. If you're talking about playing a chord on, say, guitar or keyboard, then without the root it will sound odd, as it's not really a chord, which traditionally has 3 notes minimum (guitarists will disagree and talk about a '5 chord').

Don't forget, though, that chords may have more than 3 notes : let's take Cmaj7. When it's played without the root C , we're left with E-B-G. This happens to constitute an E minor, which is not, obviously, the same chord as the C major. Let's take a G7 chord - G-B-D-F.Sounds, funnily enough, like a dominant 7th. Take the root G away, and we have B-D-F, which is a minor flat 5 chord - different. In context, they may or may not sound similar but the moment the bass puts in the expected root, it's G7.

To answer the question, it's used, and is called C (no root) I've not come across it often, but generally, someone else will be putting in the missing note.

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In the key of C major, if a trio of voices were singing BDF and they resolved into CEG, I would think it would be more meaningful to view the progression as a V7->I rather than as a vii°->I, even in the absence of the G on the first chord; YMMV. –  supercat Jul 9 '13 at 22:12
    
It could just as easily resolve to A minor,with the absence of an E on the first chord, viewing the progression as III7b9 ->VIm. What's YMMV ?? –  Tim Jul 11 '13 at 20:18
    
YMMV means Your Mileage May Vary. At least in the US, when automakers advertise their vehicles, they include government estimates of fuel economy but then add a disclaimer that "actual mileage may vary". The expression "Your mileage may vary" derives from that. –  supercat Oct 19 at 0:07

It's important that a chord contain the root of the chord, but not necessarily the root of the underlying scale. A G Major chord played as part of the C Major scale will not contain the note C.

Occasionally, you don't need to include the root of the chord either. Particularly, if the note is covered by another instrument (or vocals) then the guitar part (or other harmony instrument, like keys) may omit the note.

A C Major chord with no root would be notated "C (no root)" or "C Maj (no root)".

Technically, what remains is a dyad (E and G) which some consider to be an incomplete chord. But depending on the context, this dyad can serve the function of the full chord, and so it's appropriate to designate it a chord.

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Is there a name/notation for a chord like this? Not exclusivly for triads without the root, that is. –  uber5001 Jul 6 '13 at 6:06
    
I've only seen it with the words "no root", in parens. –  luser droog Jul 6 '13 at 6:08
    
Thanks. This is exactly what I'm looking for. The onlly thing that could better this answer would be the name of this type of chord (if there is one). –  uber5001 Jul 6 '13 at 6:23
    
Nothing's jumping to mind, but I'll keep the brain open and update if (when) I've got more. :) If this doesn't fully answer your needs, then don't feel pressured to accept. I'd recommend waiting at least a day to give other time-zones a chance at it. –  luser droog Jul 6 '13 at 6:25

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