Songfacts®:

• Maroon 5 frontman Adam Levine wrote this with Australian singer-songwriter Sia (David Guetta's "Titanium," Rihanna's, "Diamonds"). Guitarist James Valentine told Billboard magazine: "Living here in Los Angeles we've known Sia for a long time, back from when she was just an artist, before her second act as, like, the most brilliant pop songwriter of all time, so it was really cool just to work with her."
• This features No Doubt's Gwen Stefani. The Californian band were an influence on the Maroon 5 band members in their early days when they were performing as Kara's Flowers playing grungy garage music. "It's cool for all of us to have her on the record," said Valentine. "And Adam won't shut up about how cool she is as a person. A lot of times when you meet your idols it's a letdown, but it's the opposite case with Gwen, apparently."
  
  Adam Levine and Gwen Stefani also have another connection - both are coaches on season 7 of The Voice.
• Stefani and Levine sang this on the Grammy Awards in 2015.