Helen..... Take, for example, the first three notes of Freres Jacques. In the key of C this would be : C D E C (tune goes UP 2 semitones, then UP 2 semi tones then Down 4 semitones) Inverted in the way I described this would come out as: C Bflat Aflat C (tune goes DOWN 2 semitones, then DOWN 2 semi tones then Up 4 semitones) As you can see it gives a different result to turning the music round. I hope that clarifies things.
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