Concern over a new hip-hop curriculum that refers to the founding fathers as "old dead white men" has delayed the program's rollout for at-risk students, Oklahoma City Public Schools Superintendent Karl Springer said. Known as Flocabulary, the program is a music-based educational tool that uses raps, rhythms and rhymes to help students learn and memorize everything from vocabulary and English to math and social studies. It is the US history curriculum that has raised concern. One of the rap songs, "Old Dead White Men," chronicles the shortcomings of the Founders.