Ten experts decide who and what changed the course of music history.

Arnold Schoenberg (1874-1951) is undoubtedly the great innovator in 20th-century music. Of course, if you simply follow the so-called rules he set out in his Harmonielehreof 1910 it’s pretty boring. Every part needs a rule, a system, law and order. It was left to Schoenberg’s genius to break out of these constraints and really use the 12-tone system to make great music. Of course later...

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