Here's an early home studio demo of "The Transfiguration" (circa 2003-2004), which was on "Seven Swans". This track can be found as a bonus on iTunes/Apple Music under the Illinois Album. (Thanks, Chris, for pointing this out.)
On Apple Music/iTunes, this is available as a bonus track on Illinois. You'll also find the "Jon Galaxy's Remix of Chicago (Huh?!)," "The Avalanche" (same as on The Avalanche), and "Size Too Small (Live in Brussels)," which I believe was for a radio show.