Where do polar bears keep all their money?

What rock group has four men who don't sing?

Replace my first with an F and you can start a fire Take away my first and you'll find it in a dryer. I'm the twinkle in an eye, or a flicker of light My first four start the Good witch off right

Not a trick, not pretend, nor some imagined deal, I'm what your senses prove and what your heart can feel. I stop the question 'Is this true or surreal?' Name me in one short word