Stravinsky's 1913 ballet which ushered in modern music was called

The Rite Of Spring

Explanation:

The innovative and complex rhythmic structures of music, the timbre and the use of dissonance made it an important part of twentieth century composition. Stravinsky used asymmetric rhythms, dissonance percussion, polyrhythmia, polytonality, and ostinati (persistently repeated ideas), as well as melodic fragments to create complex networks of interactive lines.

a chromatic scale uses the twelve tones of the octave, while a regular scale only uses eight, or seven different notes (as the first note is played twice)

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