E7 note mistake - why?

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Hello all,
From the following video moment, I try to understand why that E7 chord consists of the notes
E,G#,B, D

video link:

My way of thing, please correct me where and why I made the error:
1) the 4th chord is a whole note, underneath is written "7" and "#" , it starts at E.
2) My first guess it must be E,G#,B,D#

Circle of fifths:
- E has 4 #'s --> E,F#,G#,A,B,C#,D#, that is the reason I think the 7th degree should be an D#, but officially it must be an D --> E,G#,B,D (E7)

How can I know, by looking the the note (E7 not written) on the drawing board, with only the root note and accidentals, know what all notes of that chord are?

Thank you very much.
Last edited by lionlion on Thu Sep 02, 2021 3:03 pm, edited 1 time in total.

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There can be two sevenths: major & minor. It's usually the minor.
https://en.wikipedia.org/wiki/Seventh_chord

An E chord with D# would be Emaj7, also written as EΔ7.
Plain (minor) "7" is two half-notes down, which is the D.
Last edited by BertKoor on Thu Sep 02, 2021 2:41 pm, edited 3 times in total.
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I like to build music theory tools: https://www.music-chords.com/

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There are three sevenths in common practice, major, minor, and diminished. For example, a vii7 in a harmonic type of minor (incl rising melodic minor) is a diminished triad with a diminished seventh

"it's usually the minor" - in which cases? In pop music lead sheets or fake books for jazzers, a simple indication of 7 following a letter name is practically always a minor 7.

Let's look for definition; first up is major key: in triadic construction here 4 m7s are produced, one of them over a major triad.
I7 is major 7; IV7 is major 7. Diatonically this is determined by the key, in construction of harmonies by thirds.
So the minor seventh at the seventh degree (vii) is on top of a diminished triad, called half-diminished, eg., Bø. (In pop usage, usually said (B)m7b5, following jazz naming.)

Harmony class in the common practice paradigm analysis gives the triad quality then the quality of the 7:
half-diminished = diminished (triad)/minor 7; a so-called dominant seventh is a major (triad)/minor 7.
3 of the chords of the 7th in major key are minor/minor 7.

Minor has variances in construction of our 4-note harmony, owing to the (raised) sixth and seventh degree in (two) different forms of minor.
Minor key ii7 is another half-diminished harmony (eg., in A minor, B D F A).
Minor key with a raised, harmonically functioning 7 has a minor triad/major 7 on i, in fact.

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Ahhh yes. Thank you. I have a lot more to read / learn.

Found this:
http://www.uvm.edu/~dfeurzei/110/materi ... ymbols.pdf

Sometimes video's do not tell everything in detail, or I missed a lesson....
a 7 indicates Major minor 7, as someone already mentioned.

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lionlion wrote: Thu Sep 02, 2021 3:38 pm Ahhh yes. Thank you. I have a lot more to read / learn.

Found this:
http://www.uvm.edu/~dfeurzei/110/materi ... ymbols.pdf

Sometimes video's do not tell everything in detail, or I missed a lesson....
a 7 indicates Major minor 7, as someone already mentioned.
Usually referred to as a "Dominant 7th" or just a 7th. There are actually many types of 7th, depending on how Major or minor 3rds are stacked. i.e. the 7th you are asking about is a Major 3rd with a minor 3rd and another minor 3rd stacked.

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