Sousa was famous for writing "marches", so I thought it would be interesting to show a picture of him marching. I would bet the band behind him was playing one of his inspiring pieces.
One of the neat parts of Sousa Week is that we will not only look at pictures of him, but we will also be able to listen to his music. Here, for your enjoyment is "Stars and Stripes Forever". This recording is particularly poignant, in that the rendition is by Sousa's band, directed by him. Also, the piece is introduced by Sousa in his own voice.