Casting director Robert Urlich says he truly understood the extent to which Glee had become a cultural phenomenon when poring over about 40,000 applications he received from Gleeks looking to star on The Glee Project.
The reality show is similar to other televised singing contests such as American Idol in that it scours the United States for undiscovered talent.
Because they are vying for a role on Glee rather than a record deal, they needed to be more than just singers, dancers and performers.
"You have to have something that is hard to put into words, that makes people want to root for you, that makes you very accessible," Urlich says.
Contestants must be aged over 18, but still able to conceivably play a high-school student. This opened the doors to diversity, and the contestants delivered, some excelling at Broadway musical numbers, others leaning towards rock, pop, hip-hop and jazz.