Big Sean - My Last (Solo Demo, Snippet) (2010)

Big Sean's "My Last" from the album "Finally Famous (2011)" turned out to be the Detroit MC's first big break into the mainstream. Chris Brown lent an assist on the hook and bridge to make it into a radio-friendly hit. 

This snippet from September 2010, however, gives a peek into an unfinished demo of the song with Sean himself on the hook:

It's hard to argue that CB's feature is a big improvement, but it's an interesting snippet nonetheless.