You might want to investigate the introduction of sound to what were at the time silent movies. Silent Films would be shown at the movie theater, and were often accompanied by an on-site piano or organ. I believe sound was added to movies during the 1920's and are refered to as "talkies".
Charlie Chaplin's movies
Sound.
Sound.
Talking Movies
1920s
Movies about the rich and famous during the 1920s include The Big Parade, The General, Sunrise, Sherlock Jr, and many others.
The name given to movies with sound during the 1920s was "talkies".
There were more than a few but the first was The Jazz Singer.
radio
Some items might include: cars, movies, and rights for women
No, there were many female actresses such as the "It" girl Clara Bow
yes movies is the simple subject