Question: What does Rihanna sing the chorus in front of?
About the article "Love the Way You Lie", section "Synopsis".

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After Chris Brown's publicised abuse case with singer Rihanna, Def Jam president L.A. Reid wanted Trey Songz to sing the chorus instead of Chris however Santana stuck with the chorus done by Chris Brown. 
The video begins with Rihanna singing the hook while wearing a low cut cut green dress and dancing in front of tropical plants on a beach, whilst singing the hook.
Key lighting is used to place emphasis on Rihanna, whilst the backdrop remains virtually dark and unseeable.
For the first verse, Rihanna is featured dancing against a plain grey background, wearing a white top and silver glitter mini-skirt, whilst flirtatiously dancing with the male dancer.
Halfway through the verse, another scene is introduced, with Rihanna wearing a pink dress in a mirrored room, showing multiple reflections of the singer from different angles.
For the first chorus, Rihanna is mainly featured wearing the green dress on the beach, but a new scene of Rihanna wearing black lace is introduced toward the end of the chorus, where she, as well as four male dancers, perform a choreographed dance routine.
Scenes of Rihanna in the mirrored room are intercut with the previous scene for the duration of the chorus.
For the second verse, a further scene of Rihanna is depicted, this time featuring the scenes performing a dance routine with a group of female dancers, in the same setting as the one at the start of the video.
For the second chorus, another scene of the singer sitting on a chair whilst listening to music is shown.
For the remainder of the video, including the bridge and final chorus, all scenes featured in the video are intercut with one and other, displaying a total of five different scenes and settings. 
The music video was directed by Anthony Mandler, who had previously directed Rihanna videos for "Hate That I Love You" and "Shut Up and Drive".
The video was shot in Venice, Los Angeles on April 3, 2008.
The video begins with Rihanna standing in front of a black backdrop for the opening of the song.
As the first verse starts, the scene is intercut with another of Rihanna looking out the window at her boyfriend and standing behind the front door as he approaches and asks to come in.
As Rihanna walks way from the door singing the lyrics ""Don't tell me you're sorry cos you're not"", the viewer realizes that her boyfriend has perhaps done something wrong and been unfaithful.
During the first chorus and second verse, Rihanna is shown in a different outfit, this time sitting in a silver car in a garage.
As Rihanna pulls out of the garage and onto the street, her ex-boyfriend walks alongside the car as she drives and begs her to forgive him; she pulls away.
For the bridge, Rihanna is shown sitting on a bed as well as in front of the black backdrops as she reads a text message from her ex-boyfriend, who asks to meet her.
During the last chorus, Rihanna appears in a different outfit and walks into a lounge, where she puts some clothes on a table and then sits on a sofa.
As her ex-boyfriend walks in, the singer gets up and walks over to the clothes, where she withdraws some matches and strikes one, dropping it on what is made aware to be some of her ex-boyfriends clothes.
As the song comes to and end, Rihanna walks out of the room whilst he tries to put out the fire.
Erika Brooks Adickman of Idolator commented that Rihanna had once again changed her hair style and was wearing a red jacket which looked similar to the one Michael Jacksons video "Beat It".
Adickman continued to compare the content of the video to Beyoncé Knowles "Irreplaceable", writing that it was her first video to contain a plot.
But, in actuality, Rihanna's music video of her hit 2006 single "Unfaithful" from her second studio album A Girl like Me and 2007 single "Hate That I Love You" from her third studio album Good Girl Gone Bad both contain a plot. 
The music video for "Disturbia" begins in a surrealistic torture chamber where Rihanna is seen dressed in black, wearing dark make-up and having long black nails while she presses the keys of a big dark piano and looks into the camera.
As the song starts different images of Rihanna are shown.
In one of the scenes she is seen imprisoned wearing lenses that make look as if her eyes have rolled into the back of her head.
Rihanna stays in the prison with two men watching on her from the both sides.
Other scenes include Rihanna sitting on a throne chair and singing the song, while two strange women are around her.
Then, multiple people around her are holding her in front of a gas chamber.
As the chorus starts Rihanna is seen tied up in a bed from which she can't get out.
At the bridge of the song Rihanna and her dancers are performing a "Thriller"-esque dance routine.
As the second verse starts, Rihanna is seen holding a column and fire is around her.
As the song continues, Rihanna drags a man doll around a metal web.
In the second chorus she wears a metal spines corset while one tarantula is upon her arm.
In the later scene, Rihanna is in a very tiny room, with her hands and legs been tied up.
The video ends with Rihanna turning around on her chair.
According to Tamar Anitai from MTV Buzzworthy, "Disturbia" is "yin to the yang of Chris Brown's 'Wall to Wall' which features creepy crawly chicks climbing the walls in latex."
He later, listed the video at number five on the "Buzzworthy's Top 5 Most Paranoid Music Videos" stating: "In Rihanna's "Disturbia" video, obsession manifests itself in freaky-deaky tarantulas, wigs, wolves, and a creepy dude in an eye patch.
And S&M-y corsets.
Paranoia never looked so supernaturally sexy!".
Simon Vozick-Levinson from "Entertainment Weekly" also reviewed the video commenting: "It looks like she accidentally wandered into Nine Inch Nails 'Closer' video, or else some sort of freaky Victorian mental hospital".
He later continued saying that the video is not what he expected from a dance-pop song, but it's also cool that Rihanna is trying something new. 
Music video.
Production and synopsis.
Rihanna shot the music video for "What Now" inside a warehouse in Phuket, Thailand on September 17, 2013, during a tour stop of the Diamonds World Tour.
It was directed by Jeff Nicholas, Jonathan Craven, and Darren Craig from Uprising Creativity.
Nicholas and Craven previously worked on the video for Justin Timberlake's single "Tunnel Vision" from his third studio album "The 20/20 Experience".
According to Steven Gottlieb of VideoStatic the double-exposure body shots are a visible common similarity of the two videos.
On November 13, Rihanna unveiled a behind-the-scenes video via her official Vevo account.
During it she explained the concept of the video, "It's gonna be kind of eerie, very creepy because 'What Now' is one of those songs that you can get really boring with the visual.
You can get really almost expected.
Everybody's probably expecting narrative type of video, a love story of some sorts or something really soft and pretty" and then says, "It is pretty and kind of soft, but it's really a little demented."
Prior to the video's release, Rihanna posted a sneak peek of the video on YouTube.
The official music video was released to VEVO on November 15, 2013.
Rob Newman is the producer of the video, while Craven, Nicholas and Thananath Songchaikul executively produced the visual.
Sing Howe Yam performed the direction of the photography while Clark Eddy is the editor.
The video opens to Rihanna appearing on a static television screen in a simple nude gown and crucifix necklace.
She then begins to sing whilst being in a darkened room with a black gown on and later appearing in a brightened room with a white gown on.
Throughout the video, Rihanna seems to have an "emotional breakdown" and does exorcism-type dance moves.
The video switches between the creepy and the pretty Rihanna as she mopes in a sparse warehouse space, possessed by her loneliness.