Chord Help

[elpegasso]

I need help to find out what the name of a chord is.
It seems that with the left hand, the guy (in a video)
plays an A⁷ (or maybe some kind of dimished?) chord
and in the right hand he plays a C, F^#, B.

Thus, the entire keys played are C, D^#, F^#, A, C, F^#, B.

In the song, the progression chords are a II-V-I in G Mayor.  The song progession begins as Am, D, G, Em,  and at a point in the progression where the V chord D comes in, he plays that chord I mention.

Although not too clear, I made a video capture at the point where he plays that chord, so I attached it in this message so that my words turn into pictures .

I'll appreciate all the help with figuring out what this chord name is.

thanks,
Valentin

[clef]

wow thats an... ugly chord...  and he's playing it on several keyboards which makes it harder still to figure it out. 

[keyofc]

Looks to me like an F# diminished with an added 4th

[prometheus]

B7b9 would be the most sane name for this chord out of context.

But in this variation it seems to me it must be called a F#dim7add11, viidim7 chord naturally function as V chords.

It functions as a V chord. Seems to me it is just a 'normal' V7 chord with the tonic modified to D#, a drastic modification, and with the 6th added.

A dim7 chord is symmetrical. So it can be anything and go anywhere. So this chord is totally ambigue but resolves to the tonic. Any mess of notes that has the tritone of the V7 chord will function as such. In a sense the 3rd and the 7th of the V7 chord are more essential to it than the tonic. As long as it resolves a expected, to the tonic, it stays clear. In this case the F#-C is the tritone and it resolves to G-B, which is the natural way for a tritone to resolve, inward.

[arensky]

I need help to find out what the name of a chord is.
It seems that with the left hand, the guy (in a video)
plays an A⁷ (or maybe some kind of dimished?) chord
and in the right hand he plays a C, F^#, B.

Thus, the entire keys played are C, D^#, F^#, A, C, F^#, B.

In the song, the progression chords are a II-V-I in G Mayor.  The song progession begins as Am, D, G, Em,  and at a point in the progression where the V chord D comes in, he plays that chord I mention.

Although not too clear, I made a video capture at the point where he plays that chord, so I attached it in this message so that my words turn into pictures .

I'll appreciate all the help with figuring out what this chord name is.

thanks,
Valentin

If you are hearing a D V chord at this point, he must be playing the note D with a foot pedal, or another instrument is playing the note D. If the D is ommitted, the chord is still...
 
D7b9 add 6.

Another way to express this is... D13b9

The top note B is probably a melody note,  a resolving suspension. In which case the chord symbol would be most simply written as.... D7b9.

Or f#dimadd 11, as Prometheus said.

[prometheus]

Yes, the fact that C and F# are doubled means they have harmonic importance. The fact that the B is slightly out of place and on top suggests it has no harmonic importance.

To me it is not clear why this chord has a D#.

So if you want to know how this chord functions and why it is used then you should give more detail.

[steve jones]

Are you guys sure he isnt just doing the 'robot' to his crazy electro tek synth madness?

SJ

[jlh]

If you are hearing a D V chord at this point, he must be playing the note D with a foot pedal, or another instrument is playing the note D. If the D is ommitted, the chord is still...
 
D7b9 add 6.

Another way to express this is... D13b9

The top note B is probably a melody note,  a resolving suspension. In which case the chord symbol would be most simply written as.... D7b9.

Or f#dimadd 11, as Prometheus said.

I guess it depends on which hand contains the root and where it resolves to... in this case it's resolving to G Major, which makes both the D13b9 and f#dimadd11  sound plausible.  However, given the LH is playing the dim chord, perhaps it's a f#dimadd11 in  3rd inversion?

[cfortunato]

Prometheus and jlh are right.  It's a 7b9. I believe a B7b9.  It's fairly common in jazz and any 1940s-or-so pop music as a substitute for the Dominant 7.  In this case, (assuming it's a B) it would resolve to an E. 

However, it's a very odd form of it, using the D# as the bass. I imagine that would make it sounds very dischordant.

My normal form of this chord is to play the root in octaves with my left hand, and do the diminished with the right.  So a B in the left hand, and A-C-D#-F# with the right.