Key Change is a Rare Fortnite Music. This cosmetic has been leaked, and the music will hopefully be available to purchase in the near future! Key Change was first added to the game in Fortnite Chapter 2 Season 4.
How-to Get the Key Change Music
Key Change was leaked or datamined, which means we don't know for sure how it will be released. Most cosmetics that are leaked will be released within 30 - 60 days of their discovery.