Caroline Furoyen, also known by her stage name Caroline Ailin, is a Norwegian singer and songwriter based in London. She co-wrote "New Rules," a single by Dua Lipa which reached number 1 on the UK Singles Chart and US pop radio in 2017. She has also worked with a variety of other acts including, Zedd, Katy Perry, Clean Bandit, Ellie Goulding, Ella Mai, Louis the Child, and numerous others. 　　Ailin signed a publishing contract with Oslo-based Waterfall Music in May 2012. She also signed a deal with Sony/ATV Music Publishing. In 2014, she wrote "Crocodile Tears" for the producer, Grades. For her songwriting work in 2015, the Norwegian Music Publisher Association awarded Ailin with the 2016 "Breakthrough of the Year" award. That year, she co-wrote a variety of songs, including Rachel Platten's "Hey Hey Hallelujah" and Olivia Holt's "History," the last of which charted in Belgium, the Netherlands, and other locales. 　　In 2017, Ailin co-wrote Dua Lipa's single, "New Rules." The song was released in July 2017 and made it to the top of the UK Singles Chart by the following month. It also peaked at number 6 on the Billboard Hot 100 and number 1 on the Mainstream Top 40 charts in the United States in 2018. Ailin later co-wrote and was a featured performer on the Louis the Child song "Last to Leave" released in December 2017. In 2018, the Norwegian Music Publisher Association honored Ailin with the "Pop Song of the Year" award for her work on "New Rules." 　　Later in 2018, Ailin co-wrote Clean Bandit's "Mama" featuring Ellie Goulding, which reached number 28 on the Billboard Dance chart. In February 2019, the Katy Perry and Zedd song, "365," (which Ailin co-wrote) was released. Over the course of her career, Ailin has worked with a number of other artists including Zara Larsson, Hailee Steinfeld, Alex Adair, Ella Mai, Snakehips, Aanysa, Four of Diamonds, and numerous others.