Final answer:
Blues is the musical style/form that weaves a significant thread through jazz, rhythm and blues, and country and western, and is still pervasive in the music of our society today.
Step-by-step explanation:
The musical style/form that weaves a significant thread through jazz, rhythm and blues, and country and western, and is still pervasive in the music of our society today is blues.
Blues is a genre that originated from African American communities and has its roots in the Deep South of the United States. It incorporates African musical traditions, such as percussions and syncopated rhythms, along with bent or blue notes. Blues eventually influenced the development of other genres like jazz, rhythm and blues, and even rock and roll.
Today, blues continues to be influential in contemporary music and can be heard in various forms and styles across different genres.