"Whistle" (Hangul: 휘파람; RR: Hwiparam) is a song by South Korean girl group Black Pink, from their double A-side single "Square One". The lyrics were written by B.I., Teddy Park and Bekuh Boom, while the song was composed by the latter two, with additional assistance from Future Bounce. Musically, "Whistle" straddles between a minimalist hip-hop production and a more guitar-driven pop composition. The lyrics utilize a whistling motif to describe a love-call and the rhythm of a beating heart. .