The Mills Brothers were an American close harmony vocal group created in 1928 by four brothers John, Herbert, Harry and Donald Mills. Born in Piqua, Ohio, the brothers began performing in their hometown at a young age, eventually moving to Cincinnati and then to New York City where they gained popularity as a radio act. Their music was characterized by their unique sound, which blended jazz, blues, and pop traditions, and their vocal harmonies, which were often described as 'sweet' and ' gentle'.

The Mills Brothers' most famous recordings include 'Marie', 'Sleepy Time Gal', and 'Up a Lazy River', all of which became huge hits in the 1930s and 1940s. They also had a long and successful career performing in film and television, appearing in numerous motion pictures and television shows, including the popular television show 'The Ed Wynn Show'.

Throughout their careers, the Mills Brothers were known for their innovative approach to music, which blended traditional jazz and blues with modern pop and rock styles. They were also known for their charismatic stage presence, which helped to establish them as one of the most popular and enduring vocal groups of the 20th century.

Today, the Mills Brothers' music remains popular, and their legacy continues to inspire new generations of musicians and fans. Their contributions to the development of popular music are undeniable, and their influence can be heard in a wide range of musical styles, from jazz and blues to pop and rock.

The Mills Brothers' music also played an important role in American cultural history, reflecting the social and cultural changes of the 20th century. Their music addressed issues like racism, poverty, and social justice, and helped to bring attention to these issues through their unique blend of music and message.

Despite their passing in the 1960s, the Mills Brothers' music and legacy continue to thrive. Their unique sound and style have influenced countless musicians, and their music remains a beloved part of American cultural heritage.