What was this Grammy award category originally called that Jay-Z's "Vol. 2... Hard Knock Life" won at the 1999 Grammy Awards?
Capital Punishment (album):  It was nominated for Best Rap Album at the 1999 Grammy Awards, but lost to Jay-Z's "Vol. Capital Punishment (album):  2... Hard Knock Life". Grammy Award for Best Rap Album: The Grammy Award for Best Rap Album is an award presented to recording artists for quality albums with rapping at the Grammy Awards, a ceremony that was established in 1958 and originally called the Gramophone Awards.
Gramophone Awards