Musicians enlisting in the military and travel restrictions made touring difficult for the big bands and dancing became subject to a new tax, which continued for many years, affecting the choices of club owners. By the time World War II ended, the focus of popular music was shifting towards singing crooners such as Frank Sinatra and Jo Stafford. As the cost of hiring big bands had increased, club owners now found smaller jazz groups more cost-effective. Some of Ellington's new works, such as the wordless vocal feature "Transblucency" (1946) with Kay Davis, were not going to have a similar reach as the newly emerging stars.