Sometimes an x makes no sense to be plugged into a 
	   function:
	We must steer clear of dividing by 0, 
	   or taking even roots of negative numbers.

	Chorus: 
	   Doh, Domain and Range, we need to understand-
	   What can go in, what can come out are part 
	      of a function's plan!

	We won't deny there are values of y a function cannot 
	   put out-
	Like negatives from even roots or from absolutes, 
	   or 0 from a fraction with nonzero top. 
	(Repeat chorus)

	And there's no doubt we must leave out values 
	   that can't happen:
	So we'll ignore a bowling score beyond 0 and 300! 
	(Repeat chorus)