This site is absolutely valid and compliant with the W3C standards, apart from the little Flash based music playing doo-dads. There's something in their coding that upsets the powers that be, so until I come up with a workable alternative, I'm afraid we aren't strictly speaking compliant.
But the main thing is the doo-dads are working. I suspect that like us, you'd prefer to be able to hear the music, than share in a web designer's quiet inner smugness that every last ; and / is exactly in place.
If you really care, you can check out our unworthiness here. Whilst resting assured that full working validity will be restored as soon as humanly possible.