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I saw Led Zeppelin live 3 times. Each time an explanation was given, "Oh, you should have been there last night!" and supposedly Robert had blown his voice out on the high parts of all of the songs in the previous night's performance. Out of three live performances I saw back in their heyday, he could barely hit ANY of his high notes, the ones you were waiting for him to hit. .
It was evident from their 3-piece (instrumentally) live sound that they could never match their album overdubs. Don't get me wrong, they were still a very powerful band, but the sound of their albums depended heavily on studio layering of tracks. Bonham and Page's solos were dynamite, and they were the epitome of the phrase "not bad for a 3-piece". In order to compensate for the lack of filler, they would play the entire concert at the sound pressure level of a 747 taking off inside the arena.
That said, Plant's current level of his voice is much less robust than it was even when I saw him with a "blown"" voice from the "night before". The moment above at 55:00 to 55:20 doesn't make up for the 55 minutes leading up to it and the time after. Nothing against Robert, he's a great artist and was once a powerful singer with a huge range. If he had taken better care of his voice and his body, he could still have a good chunk of his old voice to this day. Let that be an encouragement to us all to listen to Ken and avoid the temptations of strain and vocal abuse.
You want to be able to sing for as long as you live!
Listen to him here.
What a difference a year makes: