George Gershwin, 1898-1937, was one of the most well-known pianists in history. He turned out an enormous amount of music before his life was cut short by a brain tumor. Lucky for us, he was one of the first musicians for whom we have recorded video of him playing. While you can probably find better quality recordings of his work, enjoy watching him play.
You can read more about Gershwin and find even more videos here: https://cmcomposerstudy.wordpress.com/2017/11/13/george-gershwin-1898-1937/
As I’m sure you remember, doing the composer study is pretty simple. Listen to some music by a composer with your children over time. Dance. Draw. Sit. Walk. Most importantly, enjoy the sound. That’s the basic method. (There is a lot of information about composer study there on Megan Hoyt’s blog, linked just above.)