Radio killed the variety star
The beginning of the broadcast era was an era of technological magic and social upheaval. Men flew, pictures moved, electricity replaced gas, and the meatgrinder of WWI consumed the world in fire and blood.
It was an amazing time to be alive, if you survived. Welcome to the 20th century.
But through the suffering and upheaval came change. After the war, hemlines rose, society relaxed, and music flooded the airwaves. The wireless became a source of news, entertainment, and joie de vivre — and with this, music programming became ubiquitous. Now consumers could listen to music at home.