「Sweet Refrain – Perfume」Wiki
"Sweet Refrain" is a song by Japanese girl group Perfume, which will be served as their first single from their upcoming album. The song was only produced and written by long-time collaborator Yasutaka Nakata. Unlike their previous efforts, the songs introduces different musical composition, including elements of dance-pop and dubstep. The song was released, both physically and digitally on November 27, 2013. It was not featured on their latest album Level3, sparking rumours that the group is working on a fifth studio album.
(Wikipedia contributors. "Sweet Refrain." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 15 Apr. 2014. Web. 2 May. 2014.)