Here's a Wikipedia article
Here's a page on Eventful with more information and a way for you to "demand" Jonathan come to your town (cool concept!).
And here's a podcast that played three of Jonathan's songs, full length because of Creative Commons.
The first is about an evil genius (think arch-villian, Syndrome, from The Incredibles) who lives atop a lonely mountain but with much love in his heart. Or maybe that's just the voices in his head.
The second is a tender ballad about the love of his life...his Apple Macintosh G4 laptop.
And the last is about a little furniture store called Ikea. Just some oak and some pine and a handful of Norsemen. Selling furniture for college kids and divorced men.