In 2009, Bon Iver's Justin Vernon released "Woods," a stark, largely a cappella track built almost entirely from layered, heavily Auto-Tuned vocal harmonies, on the Blood Bank EP. The song marked a significant departure from the raw, unprocessed folk sound that had defined Bon Iver's breakthrough debut album, "For Emma, Forever Ago," and set the stage for the band's later, more experimental use of vocal processing and electronic textures.

"Woods" gained wider attention after Kanye West sampled it for "Lost in the World," a track on his 2010 album "My Beautiful Dark Twisted Fantasy," introducing Vernon's Auto-Tuned vocals to a much broader audience. The experiment reportedly gave Vernon a taste for manipulating his voice electronically, an approach he would go on to develop extensively on subsequent Bon Iver releases such as "22, A Million."