hi paul

I agree that when singing it is generally better for breathing to stand.
But some people prefer to sit and I suppose they get used to it.

I play guitar so when singing and playing I prefer to stand anyway.

I sometimes sing unaccompanied - never finger or hand in or on ear. When singing this way I never have any problems with pitch during the song except when I sometimes stop to encourage the audience and when I start again I can change key unconsciously.

I suppose there is some link with "the finger in the ear" and modern musicians and singers being wired up with devices in one ear and sometimes in two??

cheers

MikeL2