my offspring the poet

Q's teacher told them they would get some extra auction points if they bring in something on Friday to represent the earth's core, mantle, and crust, and tell why they picked them.
Q is going to bring in a piece of music. The staff is the core because it holds everything. The harmony is the mantle because it moves along under the music. The melody is the crust because it is "on top of" of mantle and is the thing people most remember from a piece of music. But it needs the harmony to really move.

He makes my heart all swell up!!!