He was a flautist, fiddler and piper and was part of the vibrant Irish community in Chicago at the time. During his time as chief, O'Neill recruited many traditional Irish musicians into the police force, including Patrick O'Mahony, James O'Neill, Bernard Delaney, John McFadden and James Early. He also collected tunes from some of the major performers of the time including Patsy Touhey, who regularly sent O'Neill wax cylinders and visited him in Chicago. He also collected tunes from a wide variety of printed sources.