THE MOTHERS OF INVENTION: FREAK OUT!

It's a beautiful album...It's originated from the creative folly of Frank Zappa and the mothers,an album of rhythm' n' blues brought at the provocation of the creativity and this elements give at trail of progressive rock..still before of the 70' years or In the court of Crimson king....but anyhow Frank Zappa isn't a real prog artist...but the yours creativity (basic element of progressive) approched he..at the progressive rock.