Gnarls Barkley's single Crazy stayed at number one for nine weeks in 2006
Dance act Gnarls Barkley are giving away a backwards version of their album The Odd Couple online.
Fans of Cee-Lo Green and Danger Mouse can download elpuoC ddO ehT - The Odd Couple spelt backwards - from fronttobackbacktofront.com.
The original album, which was released ahead of schedule last month, is number 19 in the UK album chart.
The group are best known for their song Crazy, which was the biggest selling single of 2006.
The track was also the first to reach number one on downloads alone.
It sold over 30,000 copies in the first week of release and stayed at number one for nine weeks.