The songs, entitled 'Nature Of The World' and 'Going Crazy', began circulating on various blogs today (April 12).

At present, it's not clear whether the tracks are destined for an official release. You can hear 'Nature Of The World' below.

Timberlake and Black Eyed Peas star Will.i.am last collaborated on the former N*Snyc star's 2006 album 'FutureSex/LoveSound'.

Last month, Timberlake hinted that he may make his long-awaited return to music this summer.

The singer and actor said he was considering making his return because he is currently not committed to any forthcoming movie roles.

Will.i.am feat Justin Timberlake - 'Nature Of The World':

(by Jason Gregory)