In this post I want to discuss the reasons why anime themes get exchanged and if it is always a good idea to change them. For examples we will take a look at some opening themes of still ongoing shows like Golden Time, Tokyo Ravens, Strike the Blood, Magi and Yowamushi Pedal.
By default a two cour anime will probably have two different opening and ending themes.
For the music, professional and popular bands, voice actors or cute songstresses are hired.
They support the anime with providing a song that already exists or make a new one.
The Opening Theme is the figurehead of an anime, it is the first thing the viewer experiences. Opening and also Ending themes consist of audio and video, animations from the anime or extra made animations that show the viewer what to expect in the first cour in a compressed, artistic format. The music tries to convey the atmosphere from an anime.