Portrait of a musician, whose name is Franco Gabriau, may be a young musician serving Ludwig's court. He has beautiful curly hair, looks serious and holds a piece of music in his hand. Because Leonardo didn't finish the portrait, he didn't sign it either. There have been various speculations about the identity of the characters in the painting, and they were once considered as the rulers of Milan. Finally, art historians infer that he is a musician according to his artistic face, slender fingers and music score in his hand.