"...if you really wanted to write an accompinament out of a hummed piece, it's not hard to do at all." ---Jazzysuite82
Obviously, you've never tried to do it yourself. There are a MILLION different chordal progressions, harmonies and counter-melodies you could use as accompaniment under a single "hummed" melody line. You can score it completely different every time, for endless interpretations. It's one of the standard exercises used in composition courses at colleges and universities.
From what you said, you make it sound like it's not anything more than filling in a few gaps here and there.
Not by a long shot.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22