Nice unknown tune

Any help appreciated

Ok so the tune is called Back In The Day by Nicky BLKMRKT and MC $pyda. Now the trouble is, this is that tune;

Nicky BLKMRKT and MC $pyda - Back In The Day

As you can see this is nothing like it. So it's one of 2 things

a) It's a remix, but by who I have no idea

or

b) It's an acapella of Back In The Day over some unknown tune.

I wish I could be of more help, but I'll keep trying for you.