"For a self-styled technophobe, his work straddled early-era electric keyboards, analogue and polyphonic synthesisers, sampling and effects units that could create the volume to fill a stadium”, says Nate Beaudry of Deep Purple Podcast.

Cataloguing all that – beyond his fabled Hammond C-3 organ – involved two years’ work and 6,000 hours of research and writing, analysing, with forensic accuracy, forty-five years of material, concert recordings, interviews and photographs. Every keyboard he played live and on record was identified and catalogued, to build a biography that was about sound and music – as much as about the man.

Lord’s brother Stephen provided rare insights into his formative musical years. Figures from the Deep Purple and Whitesnake heyday were tracked down; many had never spoken publicly about the man, the landmark musical moments (like the California Jam in 1974 with 250,000 fans attending), the keyboards and the effects units that created one of rock music's definitive sounds.