query: When was hip-hop introduced as a Grammy category?
passage: Grammy Award for Best Rap Performance
The Grammy Award for Best Rap Performance is an honor presented to recording artists for quality rap performances. It was first presented at the 31st Annual Grammy Awards in 1989 and again at the 32nd Annual Grammy Awards in 1990, after which point the award was split into two categories: Best Rap Solo Performance and Best Rap Performance by a Duo or Group. These two categories were combined again in 2012 as a result of a restructure of Grammy categories, and the reinstated Award for Best Rap Performance was presented at the 54th Grammy Awards in 2012.
passage: Heavenly (Johnny Mathis album)
This was the first Mathis LP to have a single released in the US. His cover of "Misty" made its first appearance on the "Billboard" Hot 100 chart in the issue dated October 5, 1959, and peaked at number 12 during its 17 weeks there. It also began a run of seven weeks on the magazine’s R&B chart the following month, in the November 9 issue, and reached number 10 and started 12 weeks on the UK singles chart in February 1960, where it also reached number 12. The song was inducted into the Grammy Hall of Fame in 2002. This special Grammy Award category was established in 1973 to honor recordings that are at least 25 years old and that have "qualitative or historical significance."