Baseball is a sport made famous by the United States, but which is also extremely popular in East Asian countries including Japan and South Korea. Baseball, however, is not played or watched a lot in Europe, Africa, Australia, Russia or the Middle East.
Songs can be a fun way to learn English. Different songs show different language features, but most pop songs are fairly simple. Class groups can enjoy learning together.
The use of repetition and the catchy tunes also make pop songs a good way to learn English.