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Spontaneous improvisation is making something interesting up on the spot.
Improvisation is, by definition, spontaneous. Practicing it makes spontaneity better.
The definition of deform is something that hasn't been structured/developed properly.
Improvisation means to make it up as you go without planning it ahead of time
Solo Improvisation.
Improvisation 35 was painted in 1914.
Improvisation
Rhythmic improvisation
melodic improvisation
Prepared and spontaneous
Collective Improvisation.
Scat singing