These are the artists that signed up for a performance:
1. Miley Cyrus - Revolution Records
2. Krewella - Revolution Records
3. Rihanna - #DiamondsRecordingStudios
4. Tegan and Sara - Nineteen Records
5. Demi Lovato - Stronger Records
6. Christina Aguilera - Stronger Records
7. Selena Gomez - Neptune Records
Katy Perry Performs At Rihanna Concert
(forgive me for errors ) It started out with a high energy performance of her single Perfect Memory. She did choreo and sang onkey like other performances. She then told the audience that she's performing a new song called Turn The Lights Out, it was a dancepop song that sounded like a smash, and as soon as she finished the first verse, she suddenly yelled out "To perform with me, the baddest bitch in music who's headlining this very show; Rihanna!" The crowd screamed as Rih came on stage and they had a lot of chemistry on stage.
Lately I've been working on implementing some new ways to amp up the competition. Be prepared. Some of you will find luck and will earn easily and some of you will find yourself having to fight to not lose anything. Get ready to step your game up.
The performance started as one pair danced on a violin intro of 'Breaking'. When it all ended, the beat dropped and the camera zoomed to the audience and there was Loreen! She started running to the stage and when she got there she started singing. The performance was very energetic. She was smiling, jumping and giving the audience to sing the lyrics. Apparently, they were satisfied too as you could've see there and on Twitter where Loreen generated thousands of tweets.
It becomes so dreadful to listen the album, you just want to turn it off. 40/100
Billboard
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The transition from the EDM tracks like 'Breaking' to the heartbreaking ballads like 'X&Y' is really well done! Loreen delivered it! 85/100
PerezHilton.com
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Whew does she think she is? She just throws an album full of EDM tracks and thinks she will get everyone stan for her?! Horrible! 0/100
NME
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'If She's The One' is brilliant album, but it's one that leaves a room for a few improvements, and inspires confidence that they'll happen. 80/100
BBC Music
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The whole album just confirms she is the most complete artist out there right now! The great lyrics, accompanied with the pleasure-to-ears breakdowns, make heaven! 100/100
The Guardian
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Not bad for a debut album, who leaves a space for a good follow up. Loreen proves she is artist we should keep our eyes on. 90/100
Piece Of Me is a good choice as well considering her career.....nnnn 
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I gtg in five minutes 
