The crossword solutions for the term 'Jazz or Swing' are ERA, which stands for the 'ERA of Jazz and Swing'. This ERA was a period of time in the 1920s and 1930s when jazz and swing music were popular in the United States. During this time, jazz and swing music were performed in clubs, on the radio, and in films. The ERA of jazz and swing was an important part of American culture and helped to shape the music of the 20th century.