Deep Purple had fluctuated between styles in its early years, but by 1969 vocalist Ian Gillan and guitarist Ritchie Blackmore had led the band toward the developing heavy metal style.
Deep Purple presentaba flutuacións entre estilos nos seus primeiros anos, pero en 1969 o vocalista Ian Gillan e o guitarrista Ritchie Blackmore lideraron o grupo cara a un estilo máis próximo ao heavy metal.