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This isn't a transposition job. Call it a 'transformation' if you like. The music stays at the same pitch, but some notes change. Your basic scale will be C minor rather than C major. (But it won't be quite as simple as that, unless the piece is a simple folk tune sort of melody.)

Show us sheet music for the song in question, we may be able to give more specific advice.

From major 5o minor is not a transposition - as Lawrence says.

But you can with some software e.g. finale transpose a tune from C to a minor:

• a minor 3rd down diatonic,

• then adjust 6th and 7th degrees to the melodic minor scale, augmenting f to f# and g to g# in ascending movement (or to the harmonic if you want). Now you have transformed the tune into minor and we have the variation in the relative key.

• finally you can transpose it chromatic up from Am to Cm. The dominant will be a major chord, the subdom. minor or major, depending of the augmentation of the 6th.

Interesting question! Not a clue with software, but it's possible - most times probable.

No semitones to move from/to, because it's still in C - albeit C minor. Some of the notes will remain the same - those generally speaking being C F and G - which are the I IV and V of each major and its parallel minor. The note D will remain as such also.

The problem notes will be the E A and B from C major. They could well stay as they are (except the E which would always become E♭) as C minor could use A or A♭ and B or B♭.

This is where your ear comes in (or out to play..!), as it will decide which is more appropriate in each case.

That leads on to harmony. Usually in C minor, the chords will be those diatonic to key E♭, although the V is likely to be G major rather than Gm. Again, ears are the best judges.

And if the original song modulates at all, that in itself will cause problems that we can't attempt to solve without sight of it.