 Thank you Jon, I very much find your contributions both entertaining and informative. 
(royalty free) Music really isn't generally what I'd like to focus on, but rather some sort of ambiance for the background to add something to the entertainment value of the presentations. or even transitional segments that include a musical or some other form of non-vocal cue's between "thoughts"/ segments.
In essence, adding some "color" to the "audio" presentation. (think radiolab or This American Life, etc.)
I personally feel, adding these sorts of elements may encourage casual (hit and run) listeners to "tun in" again not only for the educational content, but for entrainment as well. Thanks again Jon    