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Key: D Major

I ii IV I

I: D Major ii: e minor IV: G Major I: D Major

closed as too broad by Richard, Todd Wilcox, Dom Jun 4 '18 at 13:18

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Welcome to Music.SE! Your question is a little broad right now and may get closed because of it. Is it possible to distill your question into a single specific problem? What have you tried? – Richard Jun 4 '18 at 1:05
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One easy way to make melodies from a chord progression is to use chord tones. Using your example, an I ii IV I progression in D would make use of these chords:

D e G D

Whose notes are:

(D, #F, A) (E, G, B) (G, B, D)

You could just write a melody picking from the tones from the chord you're writing over. Using this example:

enter image description here

To further spice the melody up, you can vary the rhythm and add melodic decorations such as passing tones, anticipation notes, and auxiliary notes.

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This can be done with any chord progression. For more about melodic decorations, see this website.

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