Songfacts®:

• Jessie J's first single from her sophomore album was penned by the singer with American songwriter Claude Kelly. Known as the "Studio Beast," Kelly scored his career breakthrough when he co-wrote Frankie J's 2006 "Daddy's Little Girl" single, which failed to chart. However, despite its lack of commercial success, the song helped him land a deal with Warner/Chappell Music. His work so impressed Akon that in late 2007, the American- Senegalese singer-producer asked Kelly to pen songs for him, as well as artists he was working with such as Leona Lewis ("Forgive Me"). Kelly has since written songs for such acts as Christina Aguilera, Kelly Clarkson, Miley Cyrus, Adam Lambert, and Britney Spears, as well as co-penning Jessie J's hit single "Price Tag."
• The song features two heavyweight rappers, the Godfather of UK Grime, Dizzee Rascal, and Def Jam MC Big Sean. Jessie J told Capital Radio that she wanted someone "really British" and "really American" in terms of guests. "We wrote the song and I actually had a middle eight," she explained, "and I said to Claude Kelly, who's the executive producer on this album, 'I feel like this should have a rapper on it' and I was like 'how about two?'"
• This was produced by American musician Ammo, who is signed to Dr. Luke's publishing company Prescription Songs as a producer and songwriter.
• Jessie told MTV UK that the song was inspired by her fans. "It's about when there's people trying to bring you down and pour water over your fire and dim your light," she explained. "It's about having your fans, they're like your army, and you're the person at the front that's just about to go to battle and without your soldiers you feel unsafe out there. They're my heartbeats, the things that keep me feeling like I can do this."