Zundoko-bushi (from Shojobeat Honey and Clover guide): a song that dates back to at least 1945 with multiple versions released as pop songs since then, always entitled "So and so's Zundoko-bushi" (hence 忍のズンドコ節 or Shinobu's Zundoko-bushi). Shinobu's version is based on Hikawa Kiyoshi's version.
