Ellie Goulding has released her latest single, “Army,” off of her upcoming album, Delirium. “Army” is the fourth single off of the album, and has a much different vibe than the previous three. While the others have all been empowering, upbeat dance tracks, “Army” is a more vulnerable track that turns into huge power ballad at the climax.

According to Ellie, the song was written about her best friend who has been there for her for the past ten years. In a post on Instagram she wrote:

TO MY FANS

I realised that I had focused a lot of writing on past relationships and it hit me I had never written about my best friend. The person I met in college over ten years ago. The person who was at my very first gig. The person who has seen me at my lowest and the first person I call in muffled sobs when something bad happens. We’ve been deliriously happy together, deliriously tired and deliriously sad together. I wanted to show our friendship for what it really is- honest, real, electric. I think about the times we drink together until neither of us can stand. The laughing at our own ridiculousness and foolishness. Comparing our trials and errors; over-thinking our break ups and new loves, remembering everything we’ve been through to get to this point and being so proud of it.

Ellie released a video where she is performing live from Abbey Road, and she does the song complete justice without all of the backup vocals and work that’s been done on the actual track.

Ellie’s new album, Delirium, is due to be released on November 6th. In the meantime, fans can pre-order the album on iTunes to get all of the singles that have been released so far.