One of the bands at the Unity Concert is Bobby Knightranger, a Night Ranger cover band whose members are dressed as Indiana basketball coaching legend Bobby Knight. In the original pilot episode for the show, Ron had a poster of Knight in his office, but it had to be removed for legal reasons.
The song played by Jeff Tweedy (as reunited band Land Hoe) at the Unity Concert is actually a song of his real band Wilco. The name of the song is Pickeled Ginger.
The band, Bobby Knightranger, is played by Yo La Tengo.
The producers say that the show got the band Letters to Cleo to play the event because Mark Rivers (show music supervisor and the drummer in Mouse Rat) was a real life member of the band Letters to Cleo. This is the band shirt that Ben wears many times throughout the show.