Kanye West new song demo leaks online?

An unreleased song demo rumoured to belong to rapper Kanye West has leaked online.

The snippet of a track, which is believed to be called 'Midas Touch', is a scrapped recording from Rihanna's highly-anticipated upcoming album, which West worked on, reported Billboard.

However, fans are also speculating whether it could be a different song taken from sessions for 37-year-old West's forthcoming record 'So Help Me God'.