To the Editor : Re '' An Organ Composition for the Very , Very Patient '' -LRB- front page , May 5 -RRB- : Appealingly languorous though it is , the realization of John Cage 's '' As Slow as Possible , '' or '' ASLSP , '' currently being performed in Halberstadt , Germany , is but a blink of the eye of '' Parsifal -LRB- 1882-39 ,969,364,735 A.D. -RRB- , '' by the Canadian artist Rodney Graham .