Gas and liquid, in a certain space, as far as properties permit, move freely and would mix.
That is their characteristic property.
The Oboe, Violin and Violoncello represent those element molecule and chemical compound. And I described their polymerized chemical reaction with music. Violin solo, Violin and Oboe, Oboe and Violoncello, and Violoncello solo. Music is composed of five parts, such as element and chemical reaction, of all the instruments. They are performed without pose. The music of each instruments takes symmetry proportion still it lacks perfection because of the rhythms.