Which of the following musical styles of the 1800s has helped shaped current genres such as country and rock music

The correct answer is folk music. Folk music, popular in the 1800s, has had a significant influence on current genres like country and rock music. It is characterized by storytelling, acoustic instruments, and a focus on everyday experiences. The melodies and chord progressions found in folk music have been adapted and incorporated into country and rock songs. Additionally, the lyrical style of folk music, which often conveys personal hardships and social commentary, has also influenced songwriting in these genres.