Two Incredible Casuals (Rikki Bates and Chandler Travis), one Greenhead (Steve Wood, also a charter member of the Freeze) and one Dinty Child (also of Session Americana and the Chandler Travis Philharmonic) make up the Catbirds, who present their first recorded collision with the “Viborate” EP, an urgent message from Those Who Still Rock. The quartet spent two days in a studio last November and cut more songs than they could reasonably fit on one album, so consider this the appetizer for the main course, which will follow in the fall.