User:XHanataro

Opening theme
An opening theme is the music and scenes, which used to start at the beginning of all the TV series, and where appear, almost, all the characters. It introduces the whole chapter and it used to change when the season changes.

It's very usual to find the abbreviation OP in many japanese series, where there's, also, an ending theme.

The openings used to be the main theme of the serie, and is a very sticky song. It's a easy way to make popular a serie.

Some series, like The Simpsons, have never changed their opening. But others, like in most of japanese series, changes even if the season has not finished.