Haha! Hey Juufa, I like the question.
I am not sure I can answer it, but I seem to remembering Bill Evans saying something about how he discovered he could change a tune by simply adding 1 note.
Listen to about the first 2 minutes of it.
I was thinking the other day (yes, I know it is a rare event) about arrangements of compositions. I would like to have your opinion.
What makes an arrangement an arrangement?
If say, for example, I took Chopin's Barcolle, and changed 75 notes, would that be called an arrangement?
If it is called an arrangement at 75 notes, then would it be still an arrangement at 74 notes changed? If so, then what about 73? 72? etc.
Can I even just change a handful of notes (say instead of playing a "c" with the left hand, I'd arrange it so the left hands plays an octave) and it would still be Chopin-Grocholski Barcolle.
Just a thought.