What is "concept album"

n. An album where the content follows an overall theme or narrative.

n. an album whose recording are unified by some theme (instrumental or lyrical or narrative or compositional)

A concept album loosely describes a studio album unified by a larger purpose or meaning to the album collectively than to its songs individually. This may be achieved through a single central narrative or theme, or through a sense of artistic cohesiveness. There is no clear definition.

The format originates with traditional pop singer Frank Sinatra, who released a string of concept albums throughout the 1940s and 1950s, but the term is more often associated with rock music. In the 1960s, several well-regarded concept albums were released by various rock bands, which eventually led to the invention of progressive rock and the rock opera. Since then, many concept albums have been released across many different musical genre.