I don't and it shows I know.
I figure, a bloke averages singing four songs a day, at least one each a day, and more if i am recording, I am don't have time or vox box left enough for the fiddly bits like practicing.
Time wise.
I se to keep close enough to the beat in my head all the way through most times.
I know one bloke who recorde a backing over one of my vox only sings and it never missed a beat.
And he was using a software program so the beat was the same all the way through.
After I do the Opera singing workshop this month my opinion of practice may change.
Harmonica.
I just pick it up and breathe a bit heavier than norman while flapping my hands and wiggling my tongue.
Graham


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http://www.soundclick.com/bands/2/grahamhenderson_music.htm

http://www.soundclick.com/bands/2/grahamhenderson_music.htm