Each form influenced his compositional methods. His music is firmly rooted in the structures and compositional techniques of the Classical masters. Rabindranath Tagore was a curator of melodic and compositional styles. Composers may study music theory to guide their precompositional and compositional decisions. He studied more classical and jazz-oriented compositional and playing techniques. Wide ranges of influences, both sonic and compositional, are combined in electronica recordings. Russo employed various compositional and recording techniques to build a distinctive retro sound. These terms are relative to the usage of different compositional styles. He was aware that younger composers now considered his compositional style old-fashioned. Some use "beta diversity" to refer to any of several indices related to compositional heterogeneity. Parameters of these systems can be measured without mass or compositional assumptions. This method is most often taught in conjunction with advanced compositional theory. Mediator complexes are variable at the evolutionary, compositional and conformational levels. Charles Bouleau wrote of the tension in Bruegel's compositional rhythms. There have been many attempts to unravel its historical growth and compositional layers.