Robert Plants Voice Through The Zeppelin Years 1969-1980 in Led Zep Live Posted June 5, 2014 You can tell it's a lot of sickness in his voice in '75, because the few times he's in good form he's amazing, just listen to 1975/02/06, he's on fire then! My favorite era is pretty much all but most of 73 and 75, love his late, Knebworth is great, his voice is pretty consistent in 1980 too, 1977 is a mixed bag of amazing and okay but overall really solid Oh, you're definitely right that in '75 his voice was killed by flu on the US tour and the inability to have time off to rest it...because he was much stronger at Earl's Court a few months later. Plus, he had secretly had throat surgery in 1974 (hence the raspiness of the newer tunes on PG compared to the older ones where he has the old range and power). I agree with you, he got stronger again after '75. Certainly more consistent.