According to Cecilia Rouse in the Youtube video:https://www.youtube.com/watch?v=A3Nwi1VsF3o&app=desktop

• Prior to the implementation of blind auditions, section leaders picked their favorite students to join the orchestra.
• All orchestras implemented blind auditions at the same time, so Rose's study just did a simple pre- /post- study.
• Rose controlled for the % female of auditioning musicians in her study.
• In her research, Rose identified the male/female % of orchestras using the first names of musicians listed in the playbook.