It appears that Schroeder’s piano keyboard has only 8 white keys and 4 black keys. That would not give the range that is given in the accompanying staves. But this is a cartoon and the viewer may choose whatever interpretation he or she chooses.
I’d like to add Alan Dean Foster, Mary Renault and David Eddings. One book that I’ve read many times is “The Gate to Women’s Country” by Sherri S. Tepper.
Each season had its beauties. Those of us who live where there are four of them are blessed.