Originally Posted by: bcraig4J

Now is this true that all chords are always just stacks of some kind of 3rds or is their others ways?[/quote]

Most triadic chords are yes. Hence the name! But as jarkko points out you can also build chords as fourths. Or even fifths. But that gets pretty esoteric & is rarely used outside of avant garde classical & jazz.

[quote=bcraig4J]

1,3,5,7,9,11,13 M3rd + min3rd + M3rd + min3rd + min3rd + M3rd

or two chords together like

C Major 7 + D minor = a C Maj13

C E G B. + D F A =

C E G B D F A

1,3,5,7, 9,11,13

I have a series of tutorials on extended harmony chords. The term extended refers to stacking 3rds beyond 1-3-5. The thing is that once you get to 13, the next interval is 15 & you back to the root 2 octaves higher!

So you run out of options using that approach, but you can always add a 2, 4, 6 in addition to the standard tones.

I would be careful of saying things like Cmaj 13 is "two chords put together". First, it's not an exactly correct way to think of the chord. The notes d-f-a are extentions of the C major harmony. They do happen to be the D minor triad, but the root is the C.

Unless, you are literally using all those notes like that. And that is a feature of some esoteric classical & jazz. But it's notated like a slash chord: Dminor/Cmajor7. Chord on top first, slash, chord (or note) on bottom second.

And those are not really practical on the guitar. After all there are only 6 strings. And often it's hard to find a fingering to use all of them on those complex chords!

Extended Harmony Chords 1

https://www.guitartricks.com/tutorial.php?input=1166

Extended Harmony Chords 2

https://www.guitartricks.com/tutorial.php?input=1185

Extended Harmony Chords 3

https://www.guitartricks.com/tutorial.php?input=1195

Hope that helps!