Secret Square has been played on NTS in shows including The Early Bird Show w/ PAM, featured first on 25 August 2021. Songs played include Sad Endings and Sparkly Green Couch.

Secret Square was an early side project of Apples in Stereo drummer and vocalist Hilarie Sidney. The duo comprised of Sidney and Lisa Janssen, who played bass on the Neutral Milk Hotel album On Avery Island. They had two releases, both self-titled, under the Elephant Six banner.