I don't know where that article is but you can easily do it from one key to another. Just find out what key the song is written. If in A write that scale at the top of the music.
A B C D E F GA Under the letters write:= song in key of A
O 1 23 4 5 6 7 Under that write fret numbers
D E F G A B C D= song in key of D
A tune is just a series of half and whole steps. They are a map of the tune. So you take the map of half and whole steps and put it from one key to another .
No under each note write a fret number, all the D's will be 0, all the E's will be 1, all the F#s will be 2, all the Gs will be 3., A"s will be 4,'s will by 5, C# will by 6+, and D will by 7. After you have the numbers under all the notes you should have all the melody. You are just following the same map of half and whold steps in a different key. Hope this is helpful. WHat I find about keychanges is that they are so feared and dreaded that we tend to make them twice as bad as they reallly are. After you get the melody the next step would be to put in chords. Good luck.
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