I think music is a form of Relative Truth, and it is Parikalpita in the Three Natures of Yogachara thought.
There are different musical theories in the world, we have the seven modes of Greek musical theory: Ionian, Dorian, Phrygian etc...
Then we have the classical Indian music, which has its northern and southern branches, in the southern branch, also called Carnatic music, we have 72 scales or ragas with names for each of them. (Today the carnatic music theory says there actually are 7,2 million scales, of which roughly 300 are in use!)
And we have the Arabic musical theory, which is also highly developed. Here too it happened that the arabs took the ancient greek musical system, preserved it and developed it further. At the same time in Europe only two scales or modes were in use, the Major and the Minor scales.
The main thing is that there is a correspondence between emotional states and different musical scales. That is to say the seven modes of Greek theory, the 72 scales of Carnatic musical theory, or the different musical scales of Arabic music.
In classical european music Major tonality is considered happy and Minor tonality is considered sad.
In other musical theories there are correspondingly more emotional states that are being considered, like the seven greek Modes, and the 72 basic Ragas of carnatic music.http://en.wikipedia.org/wiki/Musical_modehttp://en.wikipedia.org/wiki/Music_of_Indiahttp://en.wikipedia.org/wiki/Arabic_music