To mark the centenary of Coltrane’s birth this month, that quest is being documented on a series of previously unreleased, holy grail recordings of his nightclub experiments. Regularly taking up four- to six-week residencies in spaces such as the Jazz Gallery in Manhattan, the Showboat in Washington DC or Pep’s Lounge in Philadelphia, Coltrane would play extended sets of new material that existed purely in the moment of their making: unplanned and unruly.