Lesson with luderart

Originally Posted by luderart

B) I seem to have mistyped 'minor' instead of 'Major'. So my response is still the same: IV in Db Major.

Thanks for the other answers and explanations.

B) yes, correct.

Now I would like for you to build dominant 7th chords in these keys.

1) E Major
2) Bb Major
3) B Major,
4) Db Major
5) C Harmonic minor
6) F Harmonic minor
7) Eb Harmonic minor
8) A Harmonic minor

Originally Posted by Majesty

B) yes, correct.

Now I would like for you to build dominant 7th chords in these keys.

1) E Major
2) Bb Major
3) B Major,
4) Db Major
5) C Harmonic minor
6) F Harmonic minor
7) Eb Harmonic minor
8) A Harmonic minor

1) E Major B - D# - F# - A
2) Bb Major F - A - C - Eb
3) B Major F#-A#-C#-E
4) Db Major Ab- C - Eb- Gb
5) C Harmonic minor G - B - D - F
6) F Harmonic minor C - E - G - Bb
7) Eb Harmonic minor Bb - D - F -Ab
8) A Harmonic minor E - G# - B - D

A question: So the dominant 7th chord can appear only in the harmonic minor and not the melodic or natural minor (deducing from the exercises)?

Your answers are correct.
Before we go on, I want for you to think about the question you asked regarding what types of minors the Dominant 7th chord belongs to and you'll have the answer.

Yes I think the dominant 7th appears only in the Harmonic minor and the Melodic ascending minor, according to my calculations. This is because in the Natural Minor, and the Melodic Descending Minor there is a whole tone step from 7-8 and not a half tone step. And in the Dominant 7th we need a half tone step (or minor second) from 7-8 degree of the scale. This is because instead of a Major triad we would have a minor triad in the the first three notes of the Dominant 7th if we did not have a half step from the seventh degree to the eighth in the scale.

Originally Posted by luderart

Yes I think the dominant 7th appears only in the Harmonic minor and the Melodic ascending minor, according to my calculations. This is because in the Natural Minor, and the Melodic Descending Minor there is a whole tone step from 7-8 and not a half tone step. And in the Dominant 7th we need a half tone step (or minor second) from 7-8 degree of the scale. This is because instead of a Major triad we would have a minor triad in the the first three notes of the Dominant 7th if we did not have a half step from the seventh degree to the eighth in the scale.

Right. Now I just want for you to try some more. This time I will either give a key or I will give you a Dominant7th chord and you'll have to identify which key(s) it may belong to.

1) D minor
2) A Major
3) Db-F-Ab-Cb
4) C-E-G-Bb
5) F# minor
6) Eb-G-Bb-Db
7) G Major

Originally Posted by Majesty

Right. Now I just want for you to try some more. This time I will either give a key or I will give you a Dominant7th chord and you'll have to identify which key(s) it may belong to.

1) D minor
2) A Major
3) Db-F-Ab-Cb
4) C-E-G-Bb
5) F# minor
6) Eb-G-Bb-Db
7) G Major

1) D minor - A - C# - E
2) A Major E - G# - B
3) Db-F-Ab-Cb Gb Major
4) C-E-G-Bb F Major
5) F# minor C#- E#- G#
6) Eb-G-Bb-Db Ab Harmonic Minor
7) G Major D - F - A