Question:  The Blurred Lines Tour was by which American singer and record producer?
Sentence (from "Chris Gehringer"): Chris Gehringer (born September May, 27th, 1962, Teaneck, NJ) is an American mastering engineer, known for having mastered many recordings including Rihanna's "Loud", Lady Gaga’s "Born this Way" and Robin Thicke's "Blurred Lines".
Relevant evidence: No