A song produced by Calvin Harris and featuring the dulcet tones of 'Gentleman' denier Tinashe has surfaced online.

It's called '5AM' and sounds an awful lot like this (via Ultimate Music):

There's spec­u­la­tion this could have been the song Calvin was chatting about late last year that was intended for Rihanna but basically she wasn't feeling it.

It def­in­itely sounds like Rihanna could have done it.