context: Stone Faces is a Finnish singing and entertainment quartet founded by RUK course pals Ismo Sajakorpi, Ilkka Hemming, Matti "Fredi" Siitonen and Georg "Jori" Dolivo in the summer of 1965 [1].
question: Who were the Stone Faces?
answers.text: Stone Faces is a Finnish singing and entertainment quartet founded by RUK course pals Ismo Sajakorpi, Ilkka Hemming, Matti "Fredi" Siitonen and Georg "Jori" Dolivo in the summer of 1965