Which organization was formed by musicians in 1896?

The American Federation of Musicians was formed by musicians in 1896 to represent their interests and secure better working conditions, fair wages, and rights for performers in the music industry. This organization focused on the challenges musicians faced in a rapidly changing entertainment landscape, advocating for collective bargaining and agreements that ensured fair compensation and treatment for its members.

While the other organizations listed play significant roles in their respective fields within the entertainment industry, they were founded at different times and focus on different entertainment sectors. The Screen Actors Guild, for example, was established in the 1930s to protect the rights of screen actors, whereas the International Alliance of Theatrical Stage Employees and the Actor's Equity Association cater to other facets of the performance arts. The significant date of 1896 and the organization’s primary focus on musicians clearly identify the American Federation of Musicians as the correct choice.