Def. a must have for anyone's collection of greatest albums

I know I'm probably commiting sacrelige here, but oh well, this is my favorite of the great Led Zeppelin albums. Mostly because its the most ecclectic. I love the mix of bluesy hard rock (dancing days), reggae (d'yer maker), funk (the crunge), and even acoustic folk rock (over the hills and far away). It's all over the place musically but w/o sounding unfocused or overly self indulgent. The drums are amazing, the riffs and overdumbs kill, the bass plods along just right and of course Robert Plant is just amazing, period.