Need help ASAP!!! For music theory!?

Question

Hi, I have an exam soon and i need help. I need to write in the dominant 7th for the following harmonic minor keys (D major, B flat Major, G major, and F major)
How do i do that?
Thank you so much.

Answer 1

Dominant 7th of D major.... the dominant 7th is built on the 5th note of scale (the key you are in). the dominant chord is 5th... then the next note is a Major 3rd above previous note, next note is a 'minor 3rd' above previous, and the last (7th) note is a minor 3rd above previous.... or more simply put... a major chord built on 5th, and then add a minor 3rd above last/top note of major 5th chord

sooo.... For example, Dom 7th of D major.... D is the tonic... a 5th is A.... so.... a, c#, e, g (major chord built on A - 5th - and then add minor 3rd on top)

You even know that it 'sounds' correct, because the c# (which is the 7th note in a D major scale) wants to 'resolve' to the d (tonic -- 1st note -- of the major scale)...and the g on top to either f# (for D major) or f for (for d minor, the 'harmonic minor' or D major). The dominant 7th chord is the SAME for both the blah-major... and the harmonic blah-minor... doesn't matter if you are in major or minor key...

Next....

Dom 7th of B flat major... B flat is the tonic... a 5th is F.... so.... f, a, c (f major chord built on '5th'), plus minor 3rd on top is e-flat... soooo.... f, a, c, e-flat

You even know that it 'sounds' correct, because the a (which is the 7th note in a b-flat major scale) wants to 'resolve' to the b-flat (tonic -- 1st note -- of the major scale)...and the e-flat on top to either d (for b-flat major) or d-flat for (for b-flat minor, the 'harmonic minor' or b-flat major)

play the dominant 7th chords that you get on the keyboard... you'll know what I'm mean about the 'ear' just "dying"/hoping for some resolution to the root major or root minor chord...

Next...

Dom 7th of G major... G is the tonic... a 5th is D.... so.... D, F#, A (D major chord built on '5th'), plus minor 3rd on top is C... soooo.... D, F#, A, C.... F# wants to resolve to G (half step up), and the C to B (a half step down) or B-flat (a whole step down). Do you hear it when you play them?

and LASTLY... (Phew!!! :o) )

Dom 7th of F major... F is the tonic... a 5th is C.... so.... C, E, G (C major chord built on '5th'), plus minor 3rd on top is B-flat... soooo.... C, E, G, B-flat.... E wants to resolve to F (half step up), and the B-flat to A (a half step down) or A-flat (a whole step down). Do you hear it when you play them?

Hope this helps and GOOD LUCK on your exam!

See... finding dominant 7ths is not so hard after all... =)

P.S. If you really want to get on someone's nerves... play a dominant 7th chord (now that you know how to build the chord) and then just walk away from the piano (without resolve to the root chord).... it drives my mom NUTS when I do that...!!! LOL it just leaves her hanging in mid-air!!!