sentences:  Before becoming Opal Butterfly, the group was known as Cardboard Heaven They were formed in 1967 in Oxfordshire.Their original lineup consisted of Roger Warner (bass) Robbie Milne (lead guitar) 17-year-old Simon King (drums) Alan Cobb (keyboards) and vocals shared by Stuart Thornhill and Denny Sutcliffe.Locally, they performed at clubs and dance halls with a repertoire of R&B and blues standards.