Christian Songs is a record chart compiled and published by Billboard that measures the top-performing contemporary Christian music songs in the United States. The data was compiled by Nielsen Broadcast Data Systems based on the weekly audience impressions of each song played on contemporary Christian radio stations until the end of November 2013. With the Billboard issue dated December 7, 2013, the Christian Songs chart began utilizing the same methodology used for the Hot 100 chart to compile its rankings; that is, measuring the airplay of Christian songs across all radio formats, while incorporating data from digital sales and streaming activity. The Christian Airplay listing, which had been published for the first time in 2013, was based solely on Christian radio airplay, a methodology