linguistic:voice_change, quality:corruption
A concept album is an album whose tracks hold a larger purpose or meaning collectively than they do individually. This is typically achieved through a single central narrative or theme, which can be instrumental, compositional, or lyrical. Sometimes the term is applied to albums considered to be of "uniform excellence" rather than an LP with an explicit musical or lyrical motif. There is no consensus among music critics as to the specific criteria for what a "concept album" is. The format originates with folk singer Woody Guthrie's Dust Bowl Ballads (1940) and was subsequently popularized by traditional pop singer Frank Sinatra's 1940s–50s string of albums, although 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 rock opera.