Polka Bands Red Ravens Polka Band; Back Row (Left to Right): George Prucha, Mike Kucera, Ed Svoboda; Front Row (Left to Right): Joe Kovarik, Rudy Vlcek, Charlie Kral, Frank Urban “Jim” Hovorka’s Bohemian Orchestra; Left to Right: Joseph Blaha, Edward Vlasck, Paul Kisicski, “Jim” Hovorka, “Rudy” Vlcek and Emil Vala. Omaha Czech Brass Band