A previously unheard song from Lil' Wayne's forthcoming album 'Rebirth' has leaked online.

The track, entitled 'Da Da Da', emerged on various file-sharing websites over the weekend.

The song demonstrates 'Rebirth's' rock-influenced musicianship, opening with a guitar riff.

'Rebirth' is due to be released on December 21 – eight months after it was originally scheduled to hit shops.

The album features a guest appearance from Eminem on the song 'Drop The World'.

The rap-rock record is one of two new albums expected from Lil' Wayne before he is sentenced in February for attempted gun possession.

The rapper, who pleaded guilty during a court appearance in New York last month, is also preparing to release 'Tha Carter IV'.

It will mark the follow-up to 2008's 'Tha Carter III', which sold over 1 million copies in its first week of release.

(by Jason Gregory)