The piano accordion is the most common type of accordion in the United States. It was made popular in San Francisco in the early part of the 20th century when vaudeville stars Guido and Pietro Diero performed with an accordion utilizying a piano style keyboard instead of the usual buttons known in Europe.

This became a craze in accordion design and factories sprung up in the major cities of America to manufacture them.  San Francisco alone had 10 factories making accordions back in the 1920s.

The piano-style arrangment is easily learned by those who already know how to play a piano or organ.