Robert Plant really enjoys singing with Alison Krauss, but Plant said they're not like the male and female duos that were so big in the '60s and '70s.
He told the Los Angeles Times, "We’re not Dale & Grace or Sonny & Cher, but we’ve definitely got something going on. We’ve got two totally different lives running. Alison’s a lot more private than I am. I’m out in the flood. I’ve lived where I’ve always lived.”
When asked about how they approach singing together, Plant told Rolling Stone, "We kind of watch each other when we’re singing, and you can more or less tell. I’m still slightly impish, so I might hold one syllable of a word a little bit long, and she hangs on with me, and she doesn’t know when it’s going to end, that particular syllable. So if you are able to watch, the eyebrows tell everything, like she’s asking me, 'Why am I doing this? Why are you [screwing] about like this?' It’s great. And so I have this license where I can actually get away with it, and I’m singing alongside a monster singer who has great demands of how my harmony fits under the songs that she selected."
Robert and Alison are currently on a tour to support of their second album, Raise the Roof.
[Source: Classic Hits Today]