Many of our favorite musicians hit the road this summer and fall with major concert tours and it got us thinking about some important questions. Are country music fans really starting to cross over or do they stick to their genre? Which musician’s fans were most likely to come out for the final Warped Tour? Did T Swift fans boycott Harry Styles? GroundTruth observed foot traffic to the biggest concert tours this year to test fan loyalty and look for unusual overlaps in audiences.