"Yesterday" is Carner's first official single of the year, and follows on from his appearance on Joesef's "I Wonder Why" in June.
The British rapper has joined forces with one of the world's biggest producers on the new song - Madlib.
Speaking about the track and collaboration, Carner says, "It’s no secret Madlib is my musical hero. I wrote this almost two years ago, but at first had trouble with clearing the sample and thought it would never see the light of day."
He continues, "It’s really just about what it is to be black and white, in a world where you pretty much have to be one or the other. It hurts the way I felt about my race back then, is the same way I feel now. Nothing's changed since my last entry, nothings changed since the last century. I hope that soon this song is nothing more than a reminder of a different time, and collectively we’re able to move forward to a time of more respect, acceptance and understanding."
Carner is yet to follow up last year's Not Waving, But Drowning album.