It is spelt sitar but the song isn't played on one as far as I know, sounds like an open tuned acoustic.
Anyhow, Zepelin are unfortunate in the sense that they invariably get lumped in with Sabeth, Iron Maiden and all of those other (an odd good tune not withstanding) shitty, Spinal Tap type bands. In reality they wern't even in the same league, or even playing the same game.
If you feel you can tolerate a little bit of musical obesity then go all out and gorge on Pysical Graffiti, if not get something earlier and fresher like III, though IV is a good start too.
It is not something you can do without.
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