Powerhouse

Powerhouse (1937) is a instrumental musical composition by Raymond Scott, probably best known today as the iconic "assembly line" music in animated cartoons released by Warner Brothers.

Structurally, Powerhouse consists of two distinct - and seemingly unrelated - musical themes, played at different tempos. Both have been used in numerous cartoons. The first theme, sometimes referred to as "Powerhouse A", is a frantic passage typically employed in chase and high-speed vehicle scenes to imply whirlwind velocity. The slower theme, "Powerhouse B", is the "assembly line" music, which sometimes accompanies scenes of repetitive, machine-like activity. Powerhouse in its entirety places "B" in the center while "A" opens and closes the work in the sequence A-B-A.

http://en.wikipedia.org/wiki/Powerhouse_%28song%29

Powerhouse