I couldn't find a well-timed chart for Robert Plant (the one astrodatabank presents, is made from data supplied by Jimmy Page's ex-wife. I don't really think that's a reliable source, and neither do them: the Rodden rating for the chart is C), but there are still things that can be done.
Anyway, the astrodatabank chart may be found here. His noon chart is in the image below (August the 20th, 1948, West Bromwich, England):
Without the ascendant, we cannot know for sure his temperament. He has a very dry and reasonably hot Sun, a very cold and more or less dry Moon, and probably a very cold and dry Lord of the Ascendant (Mercury, in Sign and Exaltation).
So, we don't know exactly what it is, but it's surely dry.
Jimmy Page is a littler older (January the 9th, 1944, at 04:00, in Heston Middlesex, England):
Page's temperament is clearly phlegmatic, cold and dry.
So, within our limitations, we could say that they have some complementarity, although the indentification issue remains.
Their Moon, moreover, are in good relation. I wouldn't rely much on the exact position of the Moon in Plant's chart (she could be anywhere from 29º Aquarius to 11º Pisces), but she's probably not much far from that. She trines Page's Moon, both of them, of course, in water signs.
This trines means, of course, that this strong Moon in Jimmy's chart - his Lady of Geniture - sextiles very closely Robert's probable own Lord of Geniture, Mercury.
So, their best qualities ignite one another. Countless teenagers trying to play Stairway to Heaven on an acoustic guitar agree.
Speaking of Heaven, Jimmy has Jupiter very high up in the sky, and conjunct Robert's natal Sun/Saturn conjunction. Robert's Saturn high up in this Jovial Page Baloon: "Lead Zeppelin".
This is reinforced by Jimmy's airy Saturn trining closely airy Robert's Mars.
Jimmy's Venus squares Robert's Moon and Mercury.
No relationship, musical or otherwise, is without edges. This one, not only because it's a square, but because of the receptions and of the importance of the players, seems to be serious. We must remember that their careers were separate for decades (yes, they split only after Bonzo died, but we have just seen a synastry between two musical partners that survived a group member's death, among other things).
Even so - and even bearing in mind that we don't have Robert Plant's true chart -, this is another example of a fruitful and longlasting artistic / business partnership. It would be nice to compare it with John Paul Jones's and John Bonham's charts, but I don't have the time to do it now.
See you soon. Hope you enjoyed this post. If you didn't, here's Kashmir (the best song they ever recorded in my - and, people told me, Robert Plant's - opinion) to lighten you up: