Bharata describes a series of empirical experiments he did with the "Veena", then compared what he heard, noting the relationship of fifth intervals as a function of intentionally induced change to the instrument's tuning. Bharata states that certain combination of notes are pleasant, certain not so. His methods of experimenting with the instrument triggered further work by ancient Indian scholars, leading to the development of successive permutations, as well as theories of musical note inter-relationships, interlocking scales and how this makes the listener feel. Bharata discusses "Bhairava", "Kaushika", "Hindola", "Dipaka", "SrI-rāga", and "Megha". Bharata states that these have the ability to trigger a certain affection and the ability to "color the emotional state" in the audience. His encyclopedic "Natya Shastra" links his studies on music to the performance arts, and it has been influential in Indian performance arts tradition.