I strike the key of a single note in the middle of the piano. A sound rings out and gradually fades to silence. There is no rhythm or beat to the sound. This is not music. This is not organised sound.
I strike two keys on the piano. The sound rings out and gradually fades to silence. With two notes a relationship forms. There is no rhythm or beat, yet I experience the sound as more than two separate notes. I hear their combination. If I repeat the sound of two notes playing, music begins to emerge.