“Hot n Cold” is a song by American singer Katy Perry. The track was released as the album’s second single on September 9, 2008.
The song is a pop and dance-pop song which utilizes guitars and synthesizers. The lyrics of the song address a lover of Perry whose mood swings are affecting the couple’s relationship. The song opens with Perry confronting her former partner over his frequent changes of mind.
It reached number three on the Billboard Hot 100, becoming Perry’s second consecutive top three single, following “I Kissed a Girl”. It also became Perry’s second top five single in the United Kingdom, Australia, Ireland and New Zealand, and topped the charts in Finland, Germany, Canada, Norway, Spain, and Denmark, among others.