Juan D'Arienzo (1900–1976), known as El Rey del Compás (The King of Rhythm), was an Argentine violinist and orchestra leader who revolutionized tango with his energetic, fast-paced style. His rhythmic emphasis and powerful beat made his music a favorite for dancers, bringing tango back to the milongas in the 1930s. With legendary instrumental recordings and singers like Alberto Echagüe and Héctor Maure, he left a lasting legacy in the world of tango.