Re: I know you're sick of me, but...On Sat, 29 Mar 2008 08:10:58 -0700, Lumpy wrote:
> David Raleigh Arnold wrote:
>> On Sat, 29 Mar 2008 00:21:30 -0700, Lumpy wrote:
>>
>>
>> >
> sycochkn wrote:
>> > > there are a total of ten different seventh chords.
>
> Lump:
>> > I don't think I know ten. What are they?
>
> DRA:
>> A7, Am7, Amaj7, Am(maj7)
>> those 4 with b5
>> those 4 with #5
>> dim7
>> m7b5 or leading tone 7th or "half-diminished 7th" (always hated that.
>> An interval is either dim or it isn't.)
>>
>> which makes 14.
>
> I don't consider all of those as separate kinds of 7th chords.
They aren't. Only 13 are.
>
> Your last example (m7b5) is a duplicate of your 2nd example.
Yes.
>
> I think if you wanted to list every possible itieration of a 7th chord,
> you'd come up with a few more. flat and sharp 9th,
Where does adding stuff come from? 7ths are enough for today.
sharp 11th, sus 4 or
> 2 etc. How about Bm7/E and other hybrids.
>
> I don't consider a lot of those as separete types of 7th chords.
Who did?
The 7th
> can take only three forms. Any one of those three can be added on to
> nearly any kind of triad or group of extenders.
So what?
>
> I think we'd also get into a sonic problem with some theoretical
> variants. Example:
> Am(Maj7)b5
>
> That might technically be a chord. But I think it would be a stretch to
> consider that a "category" or type of 7th chord.
Not at all. You are stretching in every direction. If it's
"technically" a chord, it's a chord. There are plenty
of useless chord names, but that doesn't make a useless chord by some
other name. The worst IMO is the b13th used when there is no 5th. It's
a #5. That seems to be your point. There remain 13 types of 7th chord.
>
> Another example:
> Am7#5 is A C E# G. That's a technically possible chord. But in real
> life, it's a simple F9th. I don't think of that as a separate category
> of 7th chords either.
But you do. eb, e, e#, e in an Am7 chord is common enough. It is more
convenient to name it as an Am7 than an F9 chord then.
> I try and deal with the 7th interval as either being Maj, min or dim.
> The rest of the chord can do whatever it wants, Maj, min, dim, aug, sus,
> etc. But the "7" indicator is telling me to do only one thing. That is
> to play one of three notes with this chord.
But the problem with that is that Amaj with a m7th and Am with a maj7th
are not the same thing. daveA
--
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