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As early as 1966, with Frank Zappa's Freak Out !, concept albums started appearing that tied all the songs on an album into a thematic whole.

The Beatles followed with their album Sgt.

Pepper's Lonely Hearts Club Band ( 1967 ) incorporating significant orchestral passages and studio editing.

In the same year, The Moody Blues ' Days of Future Passed merged rock playing with orchestral accompaniment.

Procol Harum's 1968 album Shine On Brightly contained the epic length song " In Held Twas In I ".

These works and experiments led to what would become progressive rock, specifically symphonic prog in the United Kingdom.