Question: Who provided guest vocals on "We Are Young" because of his/her friendship with Bhasker?
About the article "We Are Young", section "Production".

Candidate passages:
After the poor commercial performance of their debut album, "Aim and Ignite", Fun decided to put Jeff Bhasker as producer for their second studio effort.
The band's frontman, Nate Ruess, met with Bhasker at his hotel in New York City in February 2011.
Ruess was anxious about meeting Bhasker, so he arrived early at the bar in the Bowery Hotel on the Lower East Side "and had a little to drink just to make sure I was loosened up."
According to Bhasker, he wasn't really wanting to meet the band, as he "was working with Beyoncé, and also with Alicia, Kanye and Jay-Z, and doing this had been a big goal in my life.
I had no intention of being distracted.
"Bhasker had just finished a long day in the studio with Beyoncé, and had decided to give Ruess 10 minutes.
He had previously already canceled two meetings with him.
The two began talking about music, and Ruess' desire to merge hip-hop beats and electronic effects with pop rock intrigued Bhasker, who invited Ruess up to his hotel room to show him some Beyoncé tracks he had been working on.
"Slightly tipsy and feeling inspired," Ruess belted out the chorus for "We Are Young," which at that time was an unfinished composition.
Bhasker was taken aback and automatically "freaked out," demanding he see the band for studio time "in the next few days."
The next day, Bhasker and Ruess booked a New York studio and cut a version of "We Are Young" not far from the final version of the track.
On the first day of recording at Jungle City, Bhasker programmed the drums on his Akai MPC3000 machine, a moog bass and "maybe using my little Juno 106, and we added vocals and piano.
We worked for many more days on it afterwards, but the core of the final version of the song was recorded on that first day.” After the Jungle City sessions, more vocal, guitar and piano tracks were recorded at Electric Ladyland Studios, and from there sessions continued at Enormous Studios in Los Angeles, The Village Recorder to track the children's choir, and Abbey Road Studios to record the orchestral arrangements.
The band invited Janelle Monáe to provide guest vocals on "We Are Young" through her friendship with Bhasker.
After being played the song, Monáe was enthused about the song and recorded her vocals in Bristol, England.
Bhasker further mixed the song in a 44.1 kHz/24-bit Pro Tools HD session at the course of almost two weeks, and the stereo mix was mastered using a L2 limiter and an API 550 EQ.
When Bhasker multitracked Ruess' vocals for the chorus, he noticed that it "had a Queen/Freddie Mercury vibe to it."
Guitarist Jack Antonoff called "We Are Young" the "bull's-eye center" of the sound the band was striving for while producing "Some Nights."
The song displays the influences brought by Jeff Bhasker and hip-hop music.
Antonoff agreed with the notion that the song was their de facto anthem: "It's pretty rare, because any other projects that we've done, I don't think any of us have ever had that song that was like, 'This is our band,'" Antonoff said.
"We're proud to say, 'Listen to this one song, and then come listen to the rest.
Here it is.'"
Bhasker was born in Kansas City, Kansas and raised in Socorro, New Mexico.
His mother played the piano and his Indian-born father was a medical doctor and the town's mayor for 24 years.
Bhasker was introduced to jazz by his mother and his piano teacher.
He played in the jazz band at Socorro High School, where he graduated in 1993, and then studied jazz piano and arranging at Berklee College of Music in Boston, Massachusetts.
He gigged around Boston as a keyboardist and played in a wedding band.
After playing with the '70s era R&B band Tavares, Bhasker moved to New York on September 11, 2001.
He toured with the jam band Lettuce and began focusing more on songwriting.
One of his first productions was with neo soul singer Goapele, on her album "Even Closer" (2002).
Bhasker produced a song on rapper The Game's first album, "The Documentary" (2005).
Bhasker relocated to Los Angeles, California in 2005.
He began writing with Bruno Mars, and songwriter and executive Steve Lindsey served as their mentor.
He played cover songs in a band with Mars around Los Angeles.
Bhasker then began an association with rapper/producer Kanye West.
Initially serving as a substitute keyboardist for West's Glow in the Dark Tour, he went on to become West's music director, and co-producer and co-writer on a number of songs.
Bhasker collaborated on West's albums "808s & Heartbreak", "My Beautiful Dark Twisted Fantasy" and the Jay-Z/Kanye West collaboration album, "Watch the Throne", including the songs "Welcome to Heartbreak".
"Lift Off", and "Runaway".
Bhasker received the Grammy Award for Best Rap Song for West's "All of the Lights", and the Jay-Z/Rihanna/Kanye West song "Run This Town".
Bhasker's collaborations span multiple genres, including writing and production credits on Alicia Keys's 2009 album, "The Element of Freedom", including the charting singles "Try Sleeping with a Broken Heart" and "Wait Til You See My Smile", and the album tracks, "Love Is Blind", and "Like the Sea".
In 2009, Bhasker produced the songs "Free", "Zombie", and "Heaven" for Natalia Kills, and co-wrote and produced, "Nothing Lasts Forever", from her debut album, "Perfectionist", under the alias 'Billy Kraven'.
He worked on Beyoncé's "I Care", "Rather Die Young" and "Party" from her 2011 album "4" as a writer, musician and producer.
Bhasker worked again with Alicia Keys on her 2012 album, "Girl on Fire", on the singles "Girl on Fire", and "Tears Always Win".
He has also worked on the hit singles "Just Give Me a Reason" by Pink, Lana Del Rey's "Summertime Sadness", and Emeli Sandé's "My Kind of Love".
Bhasker served as lead producer and co-writer for the band Fun's 2012 album, "Some Nights", for which he received the 2013 Grammy Award for Song of the Year for the song "We Are Young".
He was additionally nominated for Album of the Year, Record of the Year for "We Are Young", and Producer of the Year, Non-Classical. 
The most common creative process in the recording of "Some Nights" began with Ruess.
Ruess would come in with lyrics and a melody, leading Andrew Dost and guitarist Jack Antonoff to build chord structure and instrumentation from there, or "support that melody."
Dost noted that in recording, despite the composer's well-defined framework, the individuals' egos "pretty much disappear" and "everybody is happy to work towards the best possible song" cohesively together.
The dynamic between Bhasker and the band in the studio was mutually inspired, as Bhasker had never worked with a rock band before and Fun had never worked with a hip-hop producer.
Bhasker particularly enjoyed recording guitars with guitarist Jack Antonoff as he wasn't used to it, and Dost felt hearing Bhasker compose beats was "mind-blowing.
"The emphasis for Ruess on "Some Nights" was to make the songs more cohesive, as he felt his writing was "all over the place."
This meant creating songs that were concise instead of being "long and drawn out."
Bhasker was a proponent of using a single instrument to provide the biggest sounds, desiring not to "over-cram songs with ideas," declaring that everything that makes the song must be well-chosen.
Janelle Monáe collaborated with the trio on "We Are Young" through a friendship with Bhasker.
Bhasker was credited with bringing the band a bigger sound and an entirely new sonic translation to the band not present on their debut, "Aim and Ignite".
The album creates a mix of indie pop, theatric rock, and hip-hop—a sound that is credited to Bhasker.
"Some Nights" as a title floated around before any songs for the album were even created and was envisioned by Ruess.
It was inspired by how personalities can change on any given night.
Although the album isn't a concept album, the title changed the band's ideas for the album considerably, with Dost stating, "It's really nice once you have a title to know what the parameters are of what you're working on as a whole."
The band completed production on the album in October 2011.
Ruess called the seven months spent recording the record the most rewarding of any in his ten years of professional music work, calling it his career highlight. 
Jeff Bhasker (also known as Billy Kraven and U.G.L.Y.)
is an American record producer, songwriter, keyboardist, vocalist and multi-instrumentalist.
He collaborated with rapper/producer Kanye West on the albums "808s & Heartbreak", "My Beautiful Dark Twisted Fantasy" and "Watch the Throne", with Jay-Z.
He has won Grammy Awards for the songs "Run This Town" by Jay-Z, "All of the Lights" by Kanye West, and "We Are Young" by Fun. 
In March 2013, Kills confirmed that she had begun recording new material, and also announced that she was working with the American record producers Jeff Bhasker and Emile Haynie, along with the songwriting team The Smeezingtons.
Kills also collaborated with the American rapper Angel Haze.
Bhasker was the executive producer for the album, playing an important part in its development; he co-wrote every song on the album except "Daddy's Girl", and co-produced all of the songs except "Watching You".
He also played piano, organ, guitar along with Danielle Haim and Jimmy Messer and keyboards with Emile Haynie.
Haynie co-wrote two songs and was an additional producer on "Problem", "Boys Don't Cry" and the album's title track.
Bhasker mixed the songs with Tony Maserati and did the engineering with Pawel Sekwho provided background vocalsTyler Sam Johnson, Rob Suchecki and Messer.
Programming was by Bhasker, Guillaume Doubet, Glass John, Haynie and Mike Will.
Chris Athens mastered the tracks.
During an interview with "Rolling Stone", Bhasker said his work on "Trouble" was "some of best production yet", and that it "has its own dark angle on things".
Kills said confronting her past was "torture", and that the songwriting process for this album was not "a release and it was not therapeutic at all".
She explained that while she did not appreciate reliving certain moments of her life, it made her past "not obsolete", adding that it was her choice to write about her life, "to look back" and to remember.
However, she was advised to let go of all her past problems, and ignored such commentaries: "I am all of my worst memories in melodies.
Every bad thing that's happened to me has defined me, has shaped, has moulded me.
I'm sick of running away from things.
I guess this whole album is me feeling glorified and vindicated by all the worst moments in my life.
"She reiterated those sentiments during an interview with "Billboard", stating:I feel with this album ...
I'm confronting and marking down every bad thing, and making that into something important, because all that bad stuff, it stays with you, it defines you, it changes you.
Whether it’s through strength or apprehension, through fear and hesitation or defiance and overcoming, it never leaves you.
And I wanted to confront who I am and who I’ve been and everything that made me why I am how I am head-onand most of it's bad, but that doesn’t mean it’s not good music, good intentions, good entertainment, even.