The fortress of music television, MTV, is saying a painful goodbye to its nearly 30-year legacy. The channel that once redefined popular culture is pulling the plug on five of its key music channels in the UK by the end of 2025: MTV Music, MTV 90s, Club MTV, MTV Live, and MTV 80s. The flagship channel, MTV HD, will survive, but it will focus on reality shows rather than the iconic music videos that once premiered Michael Jackson’s “Thriller.” Paramount’s Bitter Pill: Cost-Cut