Metallica rules!!! Your son's gonna have a blast (or, already has!). Hopefully mom had a good time last night too.
My son's getting to that age (yikes!). But, you're right - we have to let them go little by little & trust we taught them the right things. And while its difficult - its very nice when they do the right things, make the right choices & behave like we hope they would.....and it sounds like you've raised a good one Dede (and WT)....so just be proud!