Thanks, Kenny.
I, too, listen mostly to jazz, pop, and bluegrass music but the DIs have rekindled my enjoyment of classical feeds -- largely orchestral ones that have large soundstages. Suspect you found this one long ago, but, if not, the Bela Fleck and the Flecktones "Live at the Quick" DVD is spectacular on the DIs. Wooten's bass solo can be used as a primer for illustrating the DI bass response.
BTW, if you're looking for a practice piano, there are excellent sampling instruments available as are the Korg keyboard controllers hooked up to a VST/computer. Allows the aficionado the opportunity to blend their musical and audiophile interests. Nothing beats a grand, however.