Not many keyboards with a metal case standard.
I've used all sorts of keyboard on the Macs I use, including HHKB, Model M, NEC APC-H4100E and various Cherry MX keyboards.
They all just work for most purposes, although I don't play much music on the Mac.
I use a CODE TKL at work, and Fn + page up/down does adjust the volume, so I guess the other keys in that area for play/pause/next etc. would also work.
Some keyboards have a DIP switch to swap Command and Option around as the Windows-like Alt/Win keys are opposite to the Mac layout, although I generally just swap them around in System Preferences.