Ok great, I will check the windshield drain, under the hood, and think I may have now located the ac condensate drain tube (passenger foot-well behind the left kicker panel) apparently these can become blocked and then leak water inside the cabin, one has to blast some air up the tube to clear it.
I replaced the cabin air filter a while back and am familiar with it's location, will also check around here, thanks R29
"Do you only get the musty smell when first Turing the blower on? "
Not sure yet I just noticed when wifey pulled up yesterday when I got in.