| Basically the question you are asking is both very simple and very difficult to answer. If you are looking to solve this in the most simple terms you would just play the notes of the respective chords melodically over the chords themselves. {C,E,G} over CMaj and {C,Eb,G} over Cmin. To make this more interesting you could play through different inversions of those chords too.
On the other hand if you are looking for a bigger sonic picture in terms of what scale or so on to use then you have to look beyond which chord fits over which mode in a diatonic sense. One obvious application of CMaj to cmin would be where you are playing the bVI - bvi of E (harmonic) minor. So effectively playing E harmonic minor or its 6th mode which is C lydian(#2) would work well over that. The notes of E harmonic minor are {E,F#,G,A,B,C,D#}. The notes of C lydian(#2) are {C,D#,E,F#,G,A,B}. However, there are many other applications and scales you could use. If you are a beginner this is probably a little confusing though.
Last edited by mutedeity : 04-10-2008 at 08:50 PM.
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