World Wars had an impact on the development of jazz styles. During WWII, many jazz musicians entertained troops, which increased the popularity of jazz among soldiers and their families. The war made it difficult to maintain big bands as members joined the fight overseas. Different jazz styles emerged from ragtime in the 1890s to free jazz in the 1960s, influenced by genres like blues and bebop. Major jazz musicians and composers included ragtime performer Felix Arndt, blues artist Lead Belly, and bebop innovator Charlie Parker.