The spontaneous creation or variation on an established theme within an artistic work is known as improvisation.
A rhythm that emphasizes the off or irregular beats is known as syncopation.
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Answer:
Improvisation and syncopation.
Explanation:
Improvisation in music is an act of creating a piece spontaneously or without any practice.
And syncopation in music is the displacement of rhythmical beats which is skipped because of stressing on a weak beat. Syncopation is a technical element of jazz music.
So, the correct answers according to the definition provided are Improvisation and syncopation.
