This is difficult for a number of reasons, but here is my take on it:
- The melody spans too big a pitch range. You can do this on the piano, where you have 27 octaves at your disposal, but I'm quickly running out of fretboard real estate with this.
- Jumps of a sixth or more should be followed by a stepwise motion in the opposite direction. This tune does the opposite, which gives me the impression that I am dealing with two separate voices. I actually set it in 3 parts, anything else did not work out for me.
- Still the voices tend to run into each other. There are too many parallel sixths in the example attached, but this just comes from the theme itself. Many attempts to incorporate more contrary motion results in the voices crossing each other.
- I have no idea what to do with the low E on beat 1 of bars 4 and 8. I actually like to have the major 7th in the subdominant, but it sounds off here. It actually should resolve to the 6th, not squeeze its way into the 7th of the following dominant.
- I needed to add a C above the E just mentioned in order to balance out the jumps at least to some extent. The last notes of the phrase B - C, if this should be a resolution to the tonic, requires the bass voice to go downwards, but from where? The bass voice would have to cross the melody line in order to do this, or you need a few more strings on the guitar at the lower end to get to the next low C.
As for a development - I wouldn't do it. There are too many issues for my liking with this theme.
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