[dragontamer]

That doesn't work for "accidentals".

"My Heart will go on" (Song from the Titanic movie) is a good example where no amount of transposition will work. The tension of the song comes from playing the "wrong" note. (My __heart__ will, emphasis on "Heart" is extremely tense because its an accidental: not actually in the key that its being played in).

[ptah]

accidentals have special rules when transposing to keep their character so I don't understand your point