Josh Katz:

YouTube has become a dominant force in the music industry in the last few years, particularly among younger people. With the help of YouTube’s geocoded streaming data, we set out to map the contours of music fandom and culture in the United States.
 Of the artists on the Billboard Top 100 this spring, we looked at the 50 that were most watched on YouTube in the United States between January 2016 and April 2017. Each map shows relative popularity in different parts of the country. If one part of a map is lighter, it doesn’t mean people there weren’t watching the artist’s videos; it just means fans were more likely to listen to a variety of other artists.
 See the complete set of fan maps below, listed in order of YouTube views in our data.