Analysis of information sources in references of the Wikipedia article "Iron Butterfly" in English language version.
Progressive rock emerged in the late 1960s with acts such as King Crimson, Yes, Iron Butterfly and Jethro Tull
In-A-Gadda-Da-Vida was given the distinction of being the first album to be awarded platinum status.
Erik Braunn, the Iron Butterfly guitarist who played one of rock's most recognizable riffs in the 17-minute anthem In-a-Gadda-da-Vida, died here on Friday. He was 52. The cause was cardiac arrest, his family said.
