The Duncan Sisters were a popular American vaudeville duo active in the early 20th century, composed of siblings Rosetta and Vivian Duncan. Known for their comedic and musical performances, they developed a unique style blending jazz, pop, and theater music. Their most notable work is the 1921 hit song "I'm Following You!", which they performed in the movie "It's a Great Life". Despite Vivian's untimely death in 1933, Rosetta continued to perform their repertoire, preserving the legacy of the Duncan Sisters in the annals of American entertainment history.