TheBillboard Hot 100 is a chart that ranks the best-performingsingles of the United States. Its data published byBillboard magazine and compiled byNielsen SoundScan, is based collectively on each single's weeklyphysical anddigital sales, as well asairplay andstreaming. At the end of a year,Billboard will publish an annual list of the 100 most successful songs throughout that year on the Hot 100 chart based on the information.
For 2015, the list was published on December 9, calculated with data from December 6, 2014, to November 28, 2015.[1]
The funk track "Uptown Funk" by British producerMark Ronson, featuring American singerBruno Mars, who co-wrote and voiced the lyrics was named the number 1 song of 2015, despite being released in late 2014. It spent the longest time at number 1 for the year, 14 weeks, and spent the entire year in the Top 40 region. This is also the joint-fifth longest time at number 1 for a single in the history of the Hot 100 post-1958 inception, afterLil Nas X andBilly Ray Cyrus's "Old Town Road" (19 weeks),Mariah Carey andBoyz II Men's "One Sweet Day" andLuis Fonsi,Daddy Yankee andJustin Bieber's "Despacito" (16 weeks), andHarry Styles' "As It Was" (15 weeks).
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