The death of Ali-Naqi Vaziri (Iranian musician) on September 9, 1950, marks a significant event in the history of Iranian music. Ali-Naqi Vaziri, born in 1887, was a leading figure in both traditional and modern Iranian music, playing a crucial role in transforming and teaching Iranian music. He founded a music school and worked to modernize the educational structure for music in Iran, leaving a lasting impact on future generations of Iranian musicians. Throughout his life, Vaziri composed numerous works in Iranian music and was recognized as a master tar player and composer. He also contributed to music theory and wrote educational books, aiming to teach Iranian music using scientific and modern methods. His activities during the 1920s and 1940s led to the expansion of music education in Iran, and many of his students later became prominent figures in the country's music scene. Vaziri's death on September 9, 1950, was widely noted in Iranian artistic and cultural circles. Memorial ceremonies were held with the participation of artists and music enthusiasts, and his legacy remains influential among musicians. This date serves as a reminder of Vaziri's role in the transformation of Iranian music and continues to be observed by the artistic community each year. Due to Vaziri's importance in the history of Iranian music, this event was added to some calendars by certain cultural and artistic organizations in the years following his death to commemorate his enduring influence.