Justin Bieber helped Kanye West develop his new song Ultralight Beam.

The track opens Kanye's new album, The Life of Pablo, and features Chance The Rapper and singers The-Dream, Kelly Price, and Kirk Franklin.

Producer Fonzworth Bentley reveals Justin had been in the studio with fellow beatmaker Poo Bear when he invited them to stop by his studio session, and the pop superstar ended up just contributing some of his own vocals to an early incarnation of the tune.

"I called Poo Bear, who's from College Park (Georgia) and wrote a lot of Justin Bieber's album," Fonzworth explained to TheFader.com. "And he was with Justin at the time... Poo Bear comes up (to the studio session) and catches the vibe (feels out the song).

"Justin hops on the phone and is like, 'Tell Yeezy (Kanye) whatever he needs I got it'. So Justin comes through and we vibed on that. And then 'Ye (Kanye) went right in. 'Ye was like, 'Let's all catch a freestyle'."

"In his freestyle he said, 'This is an ultralight beam'," Fonzworth continues. "He sings that and was singing the melody. Then Chance (The Rapper) catches the vibe...

"There weren't that many words, more so vibes and patterns. Then Justin got on the mic and sang some a cappella. It was free flow. It was creativity."

Justin's efforts didn't make the final cut, but it's clear he enjoyed hanging out with Kanye in the studio after previously crediting the outspoken hip-hop star with boosting his musical confidence.

"Out of anyone in the industry who is creative, (Kanye) really gets me," the 21-year-old told NME.com. "His advice is always just, 'Make music that's so good people can't hate on it.'"

"I didn't wanna bore him or waste his time," Justin continued. "So I was like, 'Can I play you these songs?' and he was like, 'I wanna hear everything.' To hear him say that, it just showed that he cared."