A lot of people are going to hate me for saying this, but one of my least favorite kinds of music, or the kind of music that I feel I’ve so got out of my system, is musicals music.

Meaning of the quote

Guy Pearce, an English actor, is saying that he really dislikes musicals and the kind of music that is used in them. He feels like he has had enough of that type of music and doesn't enjoy it anymore. Even though some people might not agree with him, he is expressing his honest opinion about his dislike for this musical genre.