Led Zeppelin musicians Jimmy Page, John Paul Jones and Jason Bonham have been working on new material.
Drummer Bonham told a radio station in Detroit that the songs could be destined for a new Led Zeppelin album.
Writing new material has been "on the cards" since the band’s one-off reunion show in London last December, he told 94.7 WCSX.
But lead singer Robert Plant has not been involved in any of the sessions, he added.
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