Do you believe that a song can have feeling even if the singer does not sing with feelings? Instead he/she is just really focused on the scales?

Playback singers are people like us. They get their hearts broken, among other things.

So it got me thinking, if they are singing a song they don't believe in, and still are able to get the required feelings in the song, does that mean they are just really concentrating on the scale variations while singing?

Or are they really trying to put those feeling they don't have or left intentionally?

Do you believe that a song can have feeling even if the singer does not sing with feelings? Instead he/she is just really focused on the scales?
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