The first is "Stayin' Alive in The Wall" by Wax Audio. The track is a mashup of the Bee Gee's "Stayin' Alive" and Pink Floyd's "Another Brick in The Wall Pt. II."
This track has great production values. The samples both sound clean, clear, and crisp and are blended together seamlessly. This mashup has a terrific chorus and even uses David Gilmour's guitar solo.
You can download this track from Wax Audio's site.