Tulsa's beautiful Union Station is filled with sound again, but now it's melodious as opposed to cacophonous. During the first half of the 20th century, Tulsa was literally at the crossroads of American music with performers both homegrown and from afar. Learn about greats like Charlie Christian, Ernie Fields Senior and Wallace Willis in detailed exhibits. Sunday jazz concerts are played in the once-segregated grand concourse. On Tuesday nights there are free jam sessions.