Broncho. Seriously these guys rule. Listen to their music and see for yourself: http://bronchoband.com/
The Dead Girls have been rocking LFK for years. Besides, they opened for KISS! L-Town Pride, watch the low quality but high energy video here: http://www.youtube.com/watch?
The Sluts make a two-piece band look easy while somehow making garage rock more sleazy. Check out this article from an amazing local music blog: http://iheartlocalmusic.com/
Another great KC rock band, Doubleplus: http://www.facebook.com/pages/