Music channels are television channels dedicated to music that show music videos, awards shows, and artist interviews to audiences who enjoy music. There are over 50 music video channels worldwide, demonstrating the significant growth of the music industry. MTV, launched in 1981, was the first music channel and originally aired music videos when live performances weren't available. It now primarily targets teenagers and adolescents with various sister channels. 4Music is a UK channel that airs music video countdowns and festival coverage. Viva replaced TMF in 2009 with an exclusive Alexandra Burke performance and incorporates programming from other Viacom networks to appeal to younger viewers.