This is vintage Purple Mark II, with Jon Lord shining on keyboards and a terrific bass line from Roger Glover.
In The Complete Deep Purple
by Michael Heatley, lead guitarist Ritchie Blackmore says he devised the guitar solo to annoy one of the engineers, stating: "I got this urge and started rubbing the guitar up and down the doorway of the control room to get all that wild guitar noise. So this bloke looks at me as if I'd lost my mind."
Running to 7 minutes 10 seconds, "Hard Lovin' Man" is track 6 on the classic In Rock
Alexander Baron - London, England