The organizations that stood out at the beginning of the twentieth century for having weekly performances were: Metropolitan Opera and NBC Symphony Orchestra.
A musical organization is a term to refer to two or more people who perform musical works using the voice or musical instruments.
At the beginning of the 20th century, there were two American musical organizations that stood out by putting on weekly performances for their viewers. These organizations were:
Learn more about orchestra in: https://brainly.com/question/19740482