Justin Bieber enlisted all types of artists to work with him on his latest musical endeavor, [article id="1687691"]Believe[/article]. While many of those [article id="1688207"]hip-hop leaning collaborations[/article] made the album, there were a number of other duets that got left on the cutting-room floor.

So, what exactly happened to those tracks? MTV News got the full scoop from Bieber's manager, Scooter Braun, during a recent interview.

Bieber shared the studio with country cutie [article id="1683050"]Taylor Swift to work on a song[/article]. In fact, [article id="1683542"]his lady love, Selena Gomez[/article], even had some high praise for the never-released track. In the end, the Swift tune just didn't fit in with the final vibe of the album, Braun explained: "It didn't go on Believe, because there's another record they want to work on. So, it just didn't make sense at this time, and the song they did just didn't make sense on this album."

In addition to Swift, Bieber was also trying to make something happen with [article id="1683753"]Maroon 5 leading man Adam Levine[/article]. "We talked with Adam Levine about doing stuff," Braun recalled. "And he wanted to, but with everything else, we could just never get the studio time in together."

Then there was the highly anticipated collaboration between [article id="1684085"]Bieber and Kanye West[/article]. Despite being pictured in the studio with Yeezy, in the end, Bieber's track with the rapper "didn't make sense at this time," Braun said.

While whatever those two cooked up in the studio might forever remain a mystery, [article id="1684496"]Bieber recalled just what Kanye[/article] had in mind for the pop superstar's musical evolution. "Basically, he was just talking about going out of the box and doing things that are different," he said. "And he's like, 'I want to just make you cool.' He wants to just basically do records that people wouldn't necessarily think I would do."

Which Justin Bieber collaboration do you hope is released someday? Tell us in the comments!