"Sweet Refrain" is a song by Japanese girl group Perfume, the first single released for their fifth studio album Cosmic Explorer.

[1] According to Popdust, the said "It sees the group heading into a new direction by adding heavy dubstep wibbles and wobbles to their signature electro-pop sound."

[3] It was subsequently confirmed that the song would be released digitally and physically in Japan on November 27, 2013,[4] and the artwork of the singles were revealed not long after.

The video opens with the girls sitting down in a white-colored art space holding analog clocks.

As the camera pans around the room in a long take, the girls are multiplied on screen as they pose and perform dance moves.