Jack White surprised Lollapalooza Argentina concertgoers with a Robert Plant duet this weekend, welcoming the Led Zeppelin vocalist onstage to perform “The Lemon Song.†The dynamic duo let their pipes wail shoulder-to-shoulder, while White shredded his axe and Plant did his best air guitar. This appearance reportedly marks the first time Plant’s performed the song since 1995, but hopefully it won’t be the last, as Plant and White are scheduled to appear at Lollapalooza Brazil this weekend. (There’s also been talk of the two joining forces for a recording in the near future.) Unrelated side note: It’s unclear what Plant says at the end of this clip, but it kind of sounds like “Jack Black and Salmon.â€