From Fred Wilson and Twitter I learned that "Tilly and the Wall are great ambassadors for Omaha Nebraska."
Indie rock refers to rock artists that are or were unsigned, or have signed to independent record labels, rather than major record labels.
Tilly and the Wall is an indie pop group from Omaha, Nebraska. They are particularly noted for having a tap dancer, Jamie Pressnall, instead of a drummer. Reportedly, they put a great show and have a hectic touring schedule. A few videos are shown below:
Tilly and the Wall - Rainbows in the Dark
Tilly And The Wall - Bad Education