Keroncong is the name of the ukulele and similar musical instruments as well as the name of the Indonesian special kind of music that uses keroncong musical instruments, flutes, and a female singer.

Keroncong music more inclined to the chord progressions and the type of tool used. Since the mid-20th century has been known for at least three kinds of keroncong, which can be recognized from the pattern of progression akordnya. For musicians who already understand the plot, accompanied keroncong songs are actually not difficult, because quite match the pattern applies. Development is done by maintaining the consistency of the pattern. In addition, there are mixed forms and adaptations.