lol, thier time signatures are "odd", only cos it's not that widely use in westrn music, but to be honest they've nicked it from armenian folk songs etc
The drummer is great...
Led Zeplin: Pffffft, that's possibly thier most pop sound, and doesn't really gel too well... have a listen to:
-"Forest" - "War" -"Spiders" -"Toxicity" - "Sweet pee" and something like "Know", but definetly make sure you listen to "deer dance".