The pitch is for high and low sound. Low sound can make something sad and high pitch can happy. The rhythm is the beat that can make someone want to dance along with it. Melody is the main part of the song you are listening to. The part where you would sing along with. Timbre is what makes like a beat or an instrument sound different so not all sounds are the same. Structure, this is how the song is all put together. Silence is when there is a pause in a song. Harmony is when different notes will play together and make the song better. Those are the Seven Key Elements.
I agree Preston but you never listed the 7 key elements