Led Zeppelin unleash unheard recordings
23 April 2014 Last updated at 09:45 BST
Legendary rock group Led Zeppelin have released two previously unheard recordings ahead of the reissue of the band's first three albums in June.
The tracks, like hundreds of others, had been carefully catalogued but then locked away in the the band's archive for decades.
The BBC's Rebecca Jones went to have a listen with the BBC 6 Music presenter Matt Everitt.