“Hot n Cold” is a song by American singer Katy Perry from her second studio album, One of the Boys (2008). She and Max Martin co-wrote the song with its producer Dr. Luke, with additional production from Benny Blanco. The track was recorded in December 2007 at Dr. Luke’s Studios and Legacy Recordings, both based in New York City, New York, and Conway Recording Studios, based in Hollywood, Los Angeles. “Hot n Cold” was released as the album’s second single on September 9, 2008, and was the first single to be released after the album. “Hot n Cold” is primarily a bubblegum pop, dance-pop, disco, and pop rock record with elements of power pop and electronic rock, and its lyrics address an unstable romantic relationship caused by a partner’s mood swings.