A previously-unheard recording of Kurt Cobain covering The Beatles song 'And I Love Her' has been unearthed.

The demo, recorded acoustically, was found by Brett Morgen - the director of new documentary 'Cobain: Montage of Heck' - during research for his film.

You can hear Cobain's take on the song, which was originally released on 'A Hard Day's Night' in 1964, below: