My father-in-law, who sings in some very impressive choirs gave me some hints after seeing my old band play.

1. Loudly and clearly sing out "Hung-Oh", very slowly, feeling each sound. You will notice that you start singing from the back of your throat (which is what most of us do all of the time). As you get through the "Oh" you will notice that the sound has moved up, through the nose, to the front of your mouth. It will feel like you are almost breathing the "Oh". That is what you want to do all of the time; breathe your lyrics. This will give you better control, and volume, and will give you more range, instantly.

2. Visualize voice bubbles coming out of the top of your head.

OK, so I never knew what in hell he meant with #2, but you'll be surprised at what #1 will instantly do for you.