If by "change keys" you mean, for instance...
The singer says: "Play the song in the key of F instead of the key of G"
In that case you'll need to transpose the whole tune, not simply change the key signature.
See: https://musescore.org/en/handbook/3/transposition
Comments
See https://musescore.org/en/handbook/3/key-signatures
If by "change keys" you mean, for instance...
The singer says: "Play the song in the key of F instead of the key of G"
In that case you'll need to transpose the whole tune, not simply change the key signature.
See:
https://musescore.org/en/handbook/3/transposition