Assertion: classical music's form | /r/HasProperty | melody
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text: Following the work of drummer Han Bennink and pianist Misha Mengelberg, musicians started to explore by improvising collectively until a form (melody, rhythm, a famous song) is found Jazz critic Kevin Whitehead documented the free jazz scene in Amsterdam and some of its main exponents such as the ICP (Instant Composers Pool) orchestra in his book New Dutch Swing.