Over the steadily plucked arpeggios that provide the harmonic backdrop, the singer croons languidly of love, yearning, sadness, and the beauty of the countryside, as the flute flits up and down the scales in free-improvisational flight. Although the instruments and the singing style are clearly descended from European origins, the chord progression takes the Western ear by surprise and provides an unsettling, ethereal flavor to the songs. The langgam jawa , a regional variant, has an even more local character with its use of Javanese gamelan scales. The music instruments are western but played in a special way which can not be found in any other part of the world. This music had been first played around the year 1600 AP .
Some people say that it was a modification or influenced by portuquese music.
Solo branch, categorically says that Kroncong music is purely Indonesian . The 61 year-old artist, a journalist strongly supports his theory. In his profession he has traveled around the world and he did not found any music similar to Kroncong even in Portugal or its ex colony. Although he has not been asked for approval, he does not mind, he is happy if others could enjoy his composition. According to Andjar Any , this development is not destructive, it is a process, it is a proof that kroncong has a place in the heart of Indonesian society.