The Creation discipline covers any activity that studies the self in order to manifest the material. Music is an art form in which the medium is sound. Common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture. The word derives from Greek μουσική (mousike), "(art) of the Muses". Music creates sympathetic vibrations on the Spiritual plane and can influence a Qi's emotional state as well as interact with the Prime Material when the appropriate frequency is found. There are a few remaining records from the Qi known as Tesla that greatly increased our knowledge of how Frequency is tied to the Prime Material.