Let all mortal flesh keep silence and with fear and trembling stand ponder nothing earthly minded. —“Let All Mortal Flesh Keep Silence,” Li­tur­gy of St. James 1 I was mediated … I was Pop. —Mike Kelley 2 Mike Kelley’s engagement and rupture with popular music began as a teen in Detroit, in the candle-lit gloom of the Catholic Church, with such polyphonic choral chants as the revised fifth-century liturgy “Let All Mortal Flesh Keep Silence.” A piece of...