You mean the blatant race and age discrimination?
Sex discrimination too. What about those that don't identify with those two genders?
Probably violates the ADA as they make no provision for the blind that are excellent singers.
Every casting call I've ever seen states ethnicity, gender/sex, often age, often height, and other things that cannot be asked of empolyees in a traditional job application. But for theater/movies this has a valid business case.
Here is one that I found that lists the enthicity, age and gender of each person in the production.
Casting "Full Circle," the story of eight friends that are coming to the end of their time together and graduating High School and some going off to college some to work and some on to other ventures. Synopsis: The story then picks up as the group reunites for their ten year reunion and all the feelings and things unsaid come out finally.
Roles Andrew (Supporting): Male, 20-30
the "hard to get to know" member of the group; tries to have other things going on so he does not have to focus on some struggles he has in his home life. Ethnicity: Caucasian, African American, Hispanic Maria (Supporting): Female, 20-30
the headstrong determined member of the group; big dreams are leading her to some big heartaches, stars in her eyes type. Ethnicity: Hispanic Michelle (Supporting): Female, 20-30
sort of the leader that is when there is a group outing or party, but often she is undecided about where her future will be taking her. Ethnicity: Caucasian, African American, Asian Mark (Supporting): Male, 20-30
"that guy" that will never change; thinks he knows it all, can get any girl in the group, everything is all about him, will he change? Ethnicity: All Ethnicities Summer (Supporting): Female, 20-30
the girl who thinks and also has all the guys chasing her, never afraid to be herself, sexy, forward not shy in anything she does. Ethnicity: Caucasian, Hispanic, Asian Kristina (Supporting): Female, 20-30
sometimes the scatter brain, also flirty when trying to compete with other girls in the group; she is kind of lost at times searching for her own way in this circle. Ethnicity: Caucasian, African American, Hispanic, Asian Lewis (Supporting): Male, 20-30
the most complex; he is a daredevil and will try anything once in school or out and about, but he is covering deeper issues and things he is searching for, inner peace. Ethnicity: Caucasian, African American, Hispanic, Asian Greg (Supporting): Male, 20-30
the star quarterback on the often lousy team, but this one year he leads them all the way to the finals, Greg really just knows about the game; he is not very book smart but the years away will change him. Ethnicity: Caucasian, African American, Hispanic Here you go… look up other productions.