The ARIA Singles Chart ranks the best-performing singles in Australia. Its data, published by the Australian Recording Industry Association, is based collectively on the weekly physical and digital sales and streams of singles.[1] In 2019, 10 songs reached number one, with "Dance Monkey" by Tones and I the longest-running. Six acts, Swae Lee, Jonas Brothers, Billie Eilish, Lil Nas X, Shawn Mendes and Tones and I, reached the top spot for the first time. With 10 weeks atop the chart, Tones and I's song "Dance Monkey" broke the record for the most weeks at number one by an Australian artist, which was previously held by Justice Crew's 2014 song "Que Sera".[2] In November, the song reached 16 weeks at number one, breaking the record for most weeks at number one in Australian chart history, previous held by Ed Sheeran's "Shape of You" (2017).[3] It spent 21 weeks atop the chart.[4]
American singer Lady Gaga (left) and American actor Bradley Cooper (right) returned to number 1 on the chart for a second time in March 2019 with their single "Shallow" after a critically acclaimed performance of the song at the 91st Academy Awards. It initially reached the top spot in October 2018.
American singer Billie Eilish earned her first number 1 single with Bad Guy". It spent two weeks at number 1 in April 2019.American rapper Lil Nas X reached number 1 with his debut single "Old Town Road", spending thirteen non-consecutive weeks at number 1.American singer Mariah Carey returned to number 1 a year later with her 1994 single, "All I Want for Christmas Is You" which first topped the chart in December 2018. It was the final single to top the chart in 2019 and the final number 1 single of the 2010s.
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