MTV was first launched in 1981 and played music videos 24/7, guided by on-air personalities known as video jockeys. The original purpose of MTV was to play music videos non-stop. While the main MTV channel no longer focuses on music videos, spin-off channels like MTV Hits and MTV Jams do still play videos. From 1995 to 2000, MTV played 36.5% fewer music videos as the novelty wore off, requiring MTV to reinvent itself for contemporary audiences. Today, MTV airs mostly reality TV shows rather than music videos.