Puerto Rico is a Commonwealth of the United States but it is not the United States. I point this out because there was some confusion on this point as expressed by some European kossacks in Jerome's diary on impeachment, and as an excuse to provide some pleasant evidence of this fact.
Listen here.
From one of the greatest singers of the 20th Century, Ismael Rivera, El Sonero Mayor.
More.
Some more typical music from the USA.
And some more background and music.