50 years ago: the dirty laughter by Ian Gillan at the end of "Speed King" is an ecstatic outburst of exalted gladness. They had just given birth to "heavy metal hard rock". An epochal song. PS: on this compilation we have the US-version of "Speed King" where the fantastic excessive whammy bar intro was omitted aiming to more success on US-market. They wouldn't hardly bear it...