page_title: List of Billboard Adult Contemporary number ones of 2015
section_title: Chart history
hierarchical_section_title: List of Billboard Adult Contemporary number ones of 2015 / Chart history
caption_attribution_description: Recording artist Rachel Platten sings ‘Fight Song’ during the 2016 Invictus Games closing ceremonies in Orlando, Fla. May 12, 2016. The song served as the theme song throughout the games. (DoD photo E. Joseph Hersom)
context_page_description: Adult Contemporary is a chart published by Billboard ranking the top-performing songs in the United States in the adult contemporary music genre. In 2015, nine different songs topped the chart in 52 issues of the magazine, based on weekly airplay data from radio stations compiled by Nielsen Broadcast Data Systems.
  On the first chart of the year, the number one position was held by Idina Menzel and Michael Bublé with their version of the 1940s song "Baby, It's Cold Outside", the song's third consecutive week at number one. The following week it was displaced by "Shake It Off" by Taylor Swift, which spent five consecutive weeks at number one. After one week off the top spot, Swift returned to number one with the song "Blank Space". She would go on to achieve a third chart-topper in the summer with "Style", and was the only act with more than one AC number one in 2015. Both "Shake It Off" and "Blank Space" also topped Billboard's all-genre chart, the Hot 100.
  Following Swift's second chart-topper of the year, British singer Ed Sheeran gained his first AC number one with "Thinking Out Loud", which spent 19 non-consecutive weeks in the top spot.
caption: Rachel Platten topped the chart with "Fight Song".
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