The Greatest Rock Song Never Played on the Radio

I never knew much about Rainbow until VH1 did their 100 Greatest Hard Rock Songs (ever!).  I think I may have remembered a reference that Ronnie James Dio was their lead singer at one time, but here, lead singer Graham Bonnet is sublime (the infamous grunt occurs at 2:33).  In the DC area, the "classic rock" station Big 100 chooses to play Tears for Fears "Shout" (???) instead of this rock perfection.