Called

Comparing the same song sung in different key

Comparing the same song sung in different key

It's called transposing. There's a system called the Nashville System where they write down key information irrespective of key, so when new singers with different ranges come along, it's easy for the band to transpose for them.

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Music Sheet Notes Interpretation
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Term for conversion between different tonalities (C major to C minor, etc.)
Transposition: Changing Keys. Changing the key of a piece of music is called transposing the music. Music in a major key can be transposed to any othe...