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Impossible  is a song by Barbadian recording artist Shontelle. It is the lead single from her second studio album, No Gravity (2010). The song was written by Arnthor Birgisson and Ina Wroldsen, and produced by Birgisson. It was released digitally on 9 February 2010. Impossible peaked at number 13 on the Billboard Hot 100 in the United States, number 33 in Canada, number nine in the United Kingdom and number five in Denmark.
Problem is a song recorded by American singer Ariana Grande, featuring Australian rapper Iggy Azalea. The song was released by Republic Records on April 28, 2014, as the lead single from Grande's second studio album My Everything (2014). The track was written by Savan Kotecha, Iggy Azalea, Ilya, and Max Martin; the latter two co-produced it with Shellback and Peter Carlsson. Problem is an uptempo dance-pop song with influences of R&B music, which comprises a melody based on drums, saxophone loops, and trumpets.