The Rod Stewart musical Tonight’s the Night rocked into Birmingham on Monday night for a week long run at New Alexandra Theatre, and proved to be loud, raucous and most definitely crowd pleasing fun. The story, by Ben Elton, revolves around the plight of young Stuart, a (let’s be honest) harmless nerd with an almighty crush on the sweet Mary. Lacking in all the departments that he thinks attracts the ladies, he makes a pact with the (she) devil to swap his soul for that of his idol, that legendary rocker and undoubted ladies man, Rod Stewart. This works initially and he gets his girl, but having the soul of…