If you are talking about the 4 on top of the other 4 it means that there are 4 beats in a measure. if you are talking about the f at the bottom that means forte, or loud (play loud)
Composition is needed for the viewers eye. It can be from the placement of a tree to the color you choose for the sky. Without composition, you don’t have an art piece. Elements in composition are line, texture, space, shape, and color.
Award-winning violinist Damien Escobar was in the Mitsubishi Eclipse commercial
I just looked it up the answer is the magic flute