As audiences got tired of Swing, out came a new form of Jazz called Bebop. like Swing, Bebop was not a typical form of Jazz. This new form relied heavily on improvisation, so much so that those performing would improvise music as they went along. The use of improvisation got the crowds going and made the music easy to enjoy. 

Bebop was created during World War ll. Its fast, chaotic, and upbeat nature was a perfect for the time period, its listeners were able to feel lifted and moved during these trying times. The creation of Bebop during World War ll meant that bands were smaller due to increased need of soldiers. As bands got smaller creativity got bigger, allowing for the new genre to grow and take hold of the culture of the 40s. 

Unlike Swing, Bebop did not involve dancing. Bebop consisted of instruments like the saxophone, trumpet, and piano ,when used right these instruments can create a distinct and rich sound which is exactly what Bebop did. 

The musical movements of both decades set the tone for other musical genres to come!