About a month ahead of its November 13 release date, Justin Bieber's upcoming album, Purpose, has been made available for pre-order on iTunes. Those who pre-order the album can see the writing credits on each track, and there are more than a few notable collaborators. 

Skrillex (Sonny Moore) is credited on four of the album's tracks, but from the hip-hop world, the album will feature contributions from Travi$ Scott aka Jacques Webster (on whose "Maria I'm Drunk," off Rodeo, Bieber featured on), Scott's right-hand guitar man Mike Dean, Big Sean aka Sean Anderson, and, most surprisingly, Nas aka Nasir Jones. It was thought that Sean and Bieber had a falling out after Biebs got particularly handsy on stage with Sean's then-girlfriend Ariana Grande during a concert in April. 

Bieber and Nas on a record together? It will certainly be worth checking out. Of course, the songwriting credits don't necessarily imply that Nas (or anyone else) will lend his vocals to the song on which he's listed. Regardless, there's probably more talent behind Purpose than any of Bieber's other albums. 

Check out Purpose's track-by-track writing credits below. 

1. Justin Bieber, Jason Boyd & Michael Tucker
2. Justin Bieber, Josh Gudwin, Sonny Moore, Michael Tucker & Theron Feemster
4. Justin Bieber, Michael Tucker, Sonny Moore, Julia Michaels & justin tranter
5. Justin Bieber, Ed Sheeran & Benjamin Levin
6. Justin Bieber, Jason Boyd, James Abrahart, Andreas Shuller, Thomas Troelsen, James Wong & Leroy Clampitt
7. Justin Bieber, Jason Boyd, Dominic Jordan, Jimmy Giannos & Sean Anderson
8. Justin Bieber, Jason Boyd, Kenneth Coby, Jacques Webster & Mike Dean
9. Justin Bieber, Julia Michaels, Clarence Coffee Jr, Sarah Hudson, Sonny Moore & Ian Kirkpatrick
10. Justin Bieber, Jason Boyd & Mark Jackson
12. Justin Bieber, Jason Boyd, Sonny Moore, Brandon Green & Nico Stadi
13. Justin Bieber, Jason Boyd, Stephen Philibin, Eben Wares, Jeremy Snyder & Scott “Scooter” Braun
14. Justin Bieber, Jason Boyd, Josh Abraham, Brandon Green, Oliver Goldstein & Saul Alexander Castillo Vasquez
15. Justin Bieber, Jason Boyd, Brandon Green, Josh Abraham, Ely Weisfeld, Nico Stadi, Josh Gudwin & Saul Alexander Castillo Vasquez
16. Justin Bieber, Jason Boyd, Andre Harris, Donovan Knight & Nasir Jones
17. Justin Bieber, Jason Boyd & Mark Jackson
18. Justin Bieber, Jason Boyd, Mark Johnson, Mason Levy & Josh Gudwin