Tritooon

Atonality
Atonality is a condition of music in which the constructs of the music do not "live" within the confines of a particular key signature, scale, or mode. To the uninitiatedlistener, atonal music can sound like chaotic, random noise. However, atonality is one of the most important movements in 20th century music.
In tonal music, one tone functions as a sort of center of gravity, and theother tones in the chromatic scale are "attracted" to it in varying degrees of strength. But in atonal music, there is no gravity. You're allowed to use any of the 12 tones in the chromatic scale anyway you like.
In 1908, pianist Arnold Schoenberg became the first known composer to write a purely atonal composition. "You lean against a silver-willow" was the 13th song in his musical collectionentitled The Book of the Hanging Gardens, op. 15. It was during this time that he first defined a 12-tone system of composition to replace tonality as an organizational tool.
In this 12-tone system,Schoenberg believed that no tone should be more important than another in a musical composition. All 12 tones were to be introduced in an order chosen by the composer. Throughout the composition, thesesame tones must recur in the same order in notes or chords. No tone can recur until all eleven other tones in the series (or tone row) have recurred.
There were a few accepted modifications to thisrule. For example, you could move all the tones up or down by a certain interval, retaining the interval relationships of the original series. You could even go in reverse (retrograde).
The Rite ofspring
This is a ballet piece composed by Igor Stravinsky. He wanted to recreate ancient times, of time of huge, untouched landscapes in which a few tribal people would gather once a year to celebratetheir relationship to the earth. They did this before every spring so that the spring would be good, they would have colourful nature.
To represent the raw material, Stravinsky found a book...