In the same way as the idea or the thought itself do not enjoy any independent copyright protection, rather only when these are cast in a form which is perceptible to the senses, a special musical style (e.g. blues, classical music, jazz, techno, etc.) or a musical theory alone is also not a legitimate work in itself. That means that a newly created musical style can also be used by others and further developed, for example, without requiring any consent (cf. a rather old but extremely good decision of the Federal Supreme Court: BGE 70 II 57 et seq. for further information).
