David Guetta puts the Jack Back rumors to rest by revealing that Jack Back is, indeed, his alias. The announcement comes paired with a 12-track mixtape that showcases a fresh side to Guetta's sonic palette and will serve as the second component to the his forthcoming studio album 7. While known best for his commercial dance hits like "Titanium" with Sia, "2U" with Justin Bieber and much more, the French star's start in music belongs to a more underground sound.