Well to be precise the original song was sung by IMonster called "Daydream in Blue" http://www.youtube.com/watch?v=EzEZOFYHGLo , but then Lupe fiasco used it to make his song as well called "Daydream" http://www.youtube.com/watch?v=yRz0U619HYA. So its a matter of which version you like to hear.