First, some basic information that might be used to provide note help for any song that ends up here:

Middle C is C4, or the first note in the yellow octave in the center of the keyboard. If I tell you that a particular note of a song is G5, that would mean the G in the 5th full octave, which is colored purple here. If the note needs to be a sharp or flat I'd note it, for example, as G5-sharp or G5-flat.
Click the link to view the help info for a song
Smiling (from the film "Man on Fire"): Full Demo
Smiling (from the film "Man on Fire"): Slow Version of Core Section
Overhead demo of my piano cover of "Permanent"
Overhead demo + notes for my version of David Cook's "Lie"