Sentence:  Or take, for example, the rehabilitation by late-twentieth-century North American theorists of <WSD>Riemannian</WSD> "Tonnetze" as a means to navigate the voice-leading intricacies of much chromatic and post-chromatic music. 
Meaning of the word marked with <WSD> tags:  Relating to the musical theories of German theorist (Hugo Riemann), particularly his theory of harmony, which is characterised by a system of "harmonic dualism".