[6][7] It was written by Randy Bachman after hearing Bob Dylan's "Ballad in Plain D", which included the phrase "she was easily undone".

The song takes its structure from new jazz guitar chords Bachman had learned from his friend and neighbour Lenny Breau.

[10] The original 4:17 version of "Undun", complete with a country guitar section at the end, appeared on The Guess Who's 1969 album, Canned Wheat, and an edit was initially released as the B-side of the single "Laughing" which peaked on August 23, 1969.

These include Phish, Hennie Bekker,[11] Steve Cole,[12] The Phil Dwyer Septet,[13] Kurt Elling,[14] Ranee Lee,[15] Sophie Milman,[16] Hugo Montenegro,[17] and Alexander Zonjic.

The song plays in the background of a fight scene between Robert De Niro and Bridget Fonda in Quentin Tarantino's 1997 film Jackie Brown.