The starting riff is something like:

	A	??(*)	A	Gm	A7

	(*) where the ?? chord is played as

	-------X-------
	-------4-------
	-------3-------
	-------4-------
	-------X-------
	-------X-------


	then it performs like this:
	(please, ignore the lyrics...i'm not sure about them)


	         Bb		   C	        Dm	Dm-C-Bb
	Well the shadow is hangin' over the valley

	      F		     C		C-F-C
	total eclipse of the moon

				    Bm
	closin' out the gate of the city

	                 G	    A
	the wind plays a wild storm(?)


With the same progression you can play the riff "what's the matter with
you baby..."