A chip butty or chip barm is a sandwich filled with chips. It originated in fish and chip shops in the British Isles in the 19th century, though the exact origin is disputed. The chip butty is associated with British working-class culture. == Sandwich == The chip butty is a sandwich filled with chips, often served with malt vinegar or ketchup. The British food writer Tim Hayward recommended using "undistinguished" soft white bread, as "this is not the place for artisanal sourdough". In The Guardian, Tony Naylor recommended using buttered soft white bread and lightly fried chips seasoned with salt...

Sonata form (also sonata-allegro form or first movement form) is a musical structure generally consisting of three main sections: an exposition, a development, and a recapitulation. It has been used widely since the middle of the 18th century (the early Classical period). While it is typically used in the first movement of multi-movement pieces, it is sometimes used in subsequent movements as well—particularly the final movement. The teaching of sonata form in music theory rests on a standard definition and a series of hypotheses about the underlying reasons for the durability and variety of the...