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## Re: a:4 chord

 From: Brett Duncan Subject: Re: a:4 chord Date: Thu, 19 Mar 2009 18:26:11 +1100 User-agent: Thunderbird 2.0.0.21 (Macintosh/20090302)

```Luc Saffre wrote:
```
```Can somebody explain what's the difference between printing "A^sus4" and
"A^4"? I had only basic music education but am helping with publishing a
songbook using Lilypond, and I thought that the difference is not
important. But now I'm afraid I'm wrong and that I'll have to check some
songs again. Is that right?
```
```
The short answer is, it depends on who you are talking to!

```
If you look at the Dolmetsch Online for example (http://www.dolmetsch.com/musictheory17.htm), you'll find there that C4 means a C major triad with an added 4th (C-E-F-G). I know several jazz musos who interpret it exactly this way.
```
OTOH, others interpret C4 as a suspended 4th (C-F-G).

```
Just to add to the confusion, some rock guitarists use this notation to indicate an inversion of the classic "power" chord, which is really just an interval of a 5th (e.g. the C5 power chord is just C-G). A C4 in this case is just an inversion of an F5 power chord, with just C-F.
```
```
Personally, I prefer to avoid the potential confusion by not using the notation C4 at all, and use Csus4 or Cadd4 to clear what I mean. (I don't have to myself the power chords, since they don't get used that often in jazz ;-).
```
```
One other thing to be aware of - if you put C:4 into LP, the chord you get is C-E-F, which doesn't actually fit any of the above interpretations of "C4". So if you want the power chord, for example, you need to enter c:4^3 to remove the 3rd.
```
HTH,
Brett

```