"To determine the most popular rock bands of all time, 24/7 Tempo generated an index based on the popularity of a band's Wikipedia page, popularity on Spotify, popularity on Facebook, and Ranker user votes as of Sep 23, 2019. Each component of the index was given equal weight except for Ranker user votes, which was weighted twice as heavily because of the significant nature of fan opinion. Wikipedia page views were calculated for the past two years, from Sep 23, 2017 to Sep 23, 2019. Popularity on Spotify was based on the number of followers on Spotify. User votes came from a list on crowdsourced ranking platform Ranker that ranked the best rock bands of all time. To be included on our list, a band had to appear on this Ranker list. A band's best-selling album is based on Recording Industry Association of America data for U.S. album sales. While there may be great rock performers born in years past who are better known as solo artists, 24/7 Tempo included only bands." - 247wallst.com
