The Harmonicats is a musical group known for their unique sound, primarily featuring the harmonica. Founded in the 1940s, they gained popularity for their instrumental performances and catchy melodies. Their music often blends elements of jazz, blues, and pop, appealing to a wide audience. The group is best recognized for their hit song "Peg O' My Heart," which became a major success in the 1940s. The Harmonicats' innovative approach to the harmonica helped elevate the instrument's status in popular music, influencing future musicians and contributing to the genre's development.