Wolfram Answer: "Girls have picked them every one. (according to the 1960s folk song by Pete Seeger and Joe Hickerson)
Acuman Answer: "I'm not really good with locations, so I don't know exactly where have all the flowers gone, but it seems to be Girls have picked them every one. (according to the 1960s folk song by Pete Seeger and Joe Hickerson)."
Hmm...so closed source, yeah?