Has anyone ever thought of tabbing out each harmonic position that works with each key? Assuming you would stay in standard, what would be the frets to use harmonics in the key of C minor and major? Also, if you know all the notes that a C add 9 chord has, and then know all the notes that harmonics play, can you play THOSE notes of harmonics under the guitars? But what would be the harmonic positions for both C minor and C major? Thank you!