I drive approximately 1.75hrs each way to work (I'm on a road warrior consultant). On top of this, I plan on being in Russia for the next two weeks. I want to listen to an audio book or podcast on my iPod to enhance my learning of music/bass guitar theory, but I can't find anything useful on iTunes. I'm looking for a solid training course on scales, modes, chord patterns, intervals; ideally with bass guitar to phonetically illustrate

the music theory discussion. Any suggestions?