When creating a jazz guitar chord melody arrangement we want to pick a chord that has the melody note as the highest note. But rather than use the stock chord changes from a lead sheet, we can often add more chords or substitute existing chords for new chords. This free online Chord Substitution Generator will give you lots of chord choices to try. Just click on a melody note and you will see a list of chord choices that have that note as the melody note (highest note in chord).
Of course there are many rules of thumb that will guide your chord additions such as making some chords dominant, adding the ii chord to a dominant chord (ii-V7), following the cycle of fourths, moving in minor thirds, tritone substitutions. You can also use your ear by trying out the chords at that website and seeing what sounds good.
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