The Who-"Tommy" (1969)

By the time "Tommy" was released The Who were already one of the great British bands of all time, however they were considered a singles band, until they released this great work (their fourth album chronologically).
"Tommy" is considered the first rock opera in history and shows the genius of its author Pete Townsend, with an epic, intense, passionate music, opulent in structures, developments, textures and sublime tones, with a great melodic, instrumental and instrumental talent vocal of the four components of The Who.
When this album was published, many called it a masterpiece and others an insult for the subject matter (it tells the story of Tommy Walker, a blind and deaf-mute boy who has innate abilities to play pinball)
Books and films were published about Tommy, it marked an entire era and it is a timeless work, but in 1969 the world was not yet ready for so much musical information, much less accepting and understanding the musical structures that The Who proposed.
Considered one of the most important albums of the 20th century, it is ranked number 96 of the 500 best albums of all time and its commercial reception reaches more than twenty million copies sold worldwide since its publication.