The Song:

At the end of 2011, Beck registered a song called "Jacksontown" in the ASCAP copyright database. I know no other info about it.

Though one of the other songs registered at the same time, "City Of Refuge" sounds like it is blues-based (it's an old blues phrase), and so does "Jacksontown." It seems most likely this was a song Beck turned into some film producers for soundtrack use, but it never was utilized.