Don't Worry, I'm Yours.

An excellent mix:

Jason Mraz vs. Bobby McFerrin vs. Israel Kamakawiwo'ole
[ http://soundcloud.com/dj-dain/dont-worry-im-yours-mashup ]

Blending the voices and tracks smoothly enough that I have to listen carefully to hear any of the transitions.

This track is more evidence for why disc-jockeying is less of a science and more of an art, in my less-than-humble opinion.