Some Deadheads use the term "X Factor" to describe the intangible element that elevates mere performance into something higher. Publicist and Jerry Garcia biographer Blair Jackson stated that "shows were the sacrament ... rich and full of blissful, transcendent musical moments that moved the body and enriched the soul." Phil Lesh himself comments on this phenomenon in his autobiography by saying "The unique organicity of our music reflects the fact that each of us consciously personalized his playing: to fit with what others were playing and to fit with who each man was as an individual, allowing us to meld our consciousnesses together in the unity of a group mind."