<human>:  In the movie ‘The Barbary Coast’, why did the pirates have a harp?
<bot>: The pirates in the movie The Barbary Coast had a harp because it was a prop. The harp was not a real instrument, but it was used to add a sense of authenticity to the movie. The harp was a fake harp, and it was used in a scene where a pirate was playing the harp.