Nowdays, trot music in Korea is very different from the musical style of the early trot, and there have been many changes in scale, rhythm, and harmony. However, the feeling given by the word ‘trot’ contains a song that was influenced by Enka during the Japanese colonial period, or a double structure that implies the keyword ‘Japanese color’. In order to discuss scales related to ‘Japanese style’ or ‘Japanese color’, it is necessary to first understand the scales of Japanese music. ‘Nevertheless, previous studies have focused on the analysis of Yonanuki major and minor scales, including trot songs. Since the 2000s, as the popularity of the trot genre has risen, the controversy over Japanese color has gradually decreased, but it is still accompanied by the theme words such as the similarity with Enka and relation with Yonanuki, and the Miyakobushi scale. This study paid attention to the fact that since 1980s the word the term Yonanuki replaced Miyakobushi and the two terms were used interchangeably. In addition to Miyakobushi, the Yonanuki scale(elimination of 4th and 7th notes) were pointed out through the structure of Minyo scales, Ryo scales, and Ritz scale. In addition, the regulations of trot music were checked. As a result, we found that the structural name and the proper name of the scale are used without distinction. In order to find the relationship between Miyakobushi and Yonanuki, we compared the Ritz and Ryo scale used in Gagaku(one of Japanese traditional music genre). Later, focused on Tetra Chord that Koizmi suggested. As a result, focusing on the method of generating the tetrachord scale, it was found that the Yonanuki descending minor scale is a conjunct Miyakobushi scale. In Yonanuki minor scale that the Miyakobushi scale is not included, it is rare feeling of Yonanuki scale mood.