Deep Purple 50th anniversary of MACHINE HEAD. This day in March 1972 Purple Records release the Deep Purple album "Machine Head" (TPSA 7504), a change from the usual Friday release date because of the next day being Good Friday. Originally scheduled for 17th March 1972, the release was delayed, an internal memo of EMI's mentions a revised release date of 30th March so that "sufficient stock is available." It entered the UK album chart for the week ending 15th April 1972 at number 4 . It was numb