After the emergence of Arnold Schnberg's Atonal music in the early 20th century, many composers composed using 12-Tone Technique. The 12-tone technique is a composition method in which all notes in one octave are evenly used to compose a song. The music, which was in discord with the public who were familiar with Tonal Music at the time, was not welcomed. However, as times changed, this composition method began to affect not only classical music but also popular musicians. In particular, in the case of jazz music that emphasizes improvisation, it can be found in the research data on work analysis that the influence of 12-Tone Techniques and Atonal Music appears in many parts of composition and performance. The purpose of this paper is to help research differentiated composition methods as well as improvisation by organizing notes that can be used in addition to Chord Tones or Scale Notes within Chords. To this end, the sound change was investigated by substituting the most useful Minor Pentatonic Scale in the popular music genre into 12 compositions (Key) in the Dominant 7th Chord. As a result, it was confirmed that there are some parts where dissonance occurs when each scale is applied, but it can be used as Passing Tone or Ornaments, and that it can be applied to composition, arrangement, and improvisation through the contrast between In Sound and Out Sound. However, this requires not only an understanding of the texture of the sound of the performer, but also a high understanding of Rhythm and Harmony.