the chord used for goodbye blue skies(floyd)....i would call it a sus chord.

If you use F# as the root instead of D, you would get an F#7 without the 3rd...
Another possibilty is to call it a Dadd4 or Dadd11 with no 5th...
One thing I'm rather certain of is that whatever you call it, it is a fragment of a chord. So try the complete F#7 and the complete Dadd4 and see which fits best in the context of the tune you use it in.

I'm null at theory though, so I don't know what possible names are "politically correct"...

thanks

I'm going to say it's a second inversion Gmaj7/D. I really hear G as the root. As per function, this shape (and it's a GOOD one) is cool to plug in for rootless Major seven chords using the top of the chord as your root, or you can add a root below, still no third in the voicing.

But this is one of those shapes you can just start bouncing the root around. Plug a fat low E under that voicing and you have a nice lush Emi9 voicing Plug a C in the bass and you start moving into polytonal sounds. Compare playing C-D-F#-G to C-E-G-D-F#-A a full poly chord (C|D) ....Add a B below that and youre now at the X-files chord....B-D-F#-G. I think this three note shape really does a lot for guitar harmony...it sounds striking on a piano, but even more effective on guitar for some reason.

So great question, the chord naming isn't as straight forward as a triad, but the rule of thumb is when you see a minor second cluster like that, the higher note is usually the root. What's the root of this chord?

D-F-B-C

Often when you start dealing with harmony that is more ambiguous, it's really up to the composer to define what tonality he means to be conveying, usually by way of a key signature...or a chord symbol in jazz...accompanied by the voicing. Wow, after several years posting in this forum I don't think I've ever seen this particular chord show up for discussion. Good find, and great question!

-sallan

ok im having a bit of trouble understanding most of that but i think i get it, so this chord could have several different roots and could be used in lots of keys?

Well, Think of that particular voicing initially as a Maj7 voicing, and it's root is the top note, in this case G. If you moved the whole shape up a whole step to A it would be Amaj7.

And yes this chord could have several different roots. As with all chords it can be used in every key.

-sallan

I don't have my guitar in front of me, but it sounds like it would be a Dsus4. It would resolve to a D major by moving the G up to an A.

look it up on a site called chordbookcafe

I think there is no question about it. It is definitely a G7 with the 5th in the root. You have the tonic, the dominant (5th), and the 7th of the G major scale.