There is a long history of the connection between music and politics, particularly political expression in music. This expression can use anti-establishment or protest themes, including anti-war songs, although pro-establishment ideas are also used, for example in national anthems, patriotic songs, and political campaigns. Many of these types of songs could be described as topical songs. Unlike many other types of music, political music is not usually ambiguous, and is used to portray a specific political message. Read more on Last.fm.