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I actually think she was pretty well back at Budokan, which is what she said at the time. She said shortly before Budokan, she suddenly got her voice back. And when I saw them there, I was actually surprised when I signed up here afterwards and read that she had had vocal problems - in fact I almost didn't believe it, because she sounded great. And you can hear that on the disc.
But now she's doing things that she never would have been able to do before. And her vibrato has really developed too, it makes me melt whenever she does her vibrato. It used to sound really uneven and shaky - listen to her trying to do vibrato in the chorus of "Shunkan Sentimental" and then compare that to the bridge (or any part) of "Awanai Tsumori no Genki de ne". It's no contest. She has a lot more control over her voice now. And she does that vibrato live; it's not some studio trick.
She's never been 100% perfect live; nobody is. Any perfect live recordings are auto-tuned; it's that simple. But she is as close to perfect live of anyone I've ever personally seen, and I've seen a lot of bands in my life.