An "Opening Theme" refers to the introductory music and visuals that set the tone for a television show, movie, or video game. It often includes a catchy melody and highlights key characters or themes, helping to engage the audience right from the start. The opening theme can vary in style, from orchestral compositions to pop songs, depending on the genre of the production. In many cases, the opening theme is accompanied by a sequence of animated or live-action clips that provide a glimpse of the storyline or setting. This combination of music and visuals serves to create anticipation and excitement, making it an essential element of works like anime, TV series, and films.