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  2. Music theory - Wikipedia

    en.wikipedia.org/wiki/Music_theory

    In modern academia, music theory is a subfield of musicology, the wider study of musical cultures and history. Music theory is often concerned with abstract musical aspects such as tuning and tonal systems, scales, consonance and dissonance, and rhythmic relationships. In addition, there is also a body of theory concerning practical aspects ...

  3. Gaia hypothesis - Wikipedia

    en.wikipedia.org/wiki/Gaia_hypothesis

    The Gaia hypothesis ( / ˈɡaɪ.ə / ), also known as the Gaia theory, Gaia paradigm, or the Gaia principle, proposes that living organisms interact with their inorganic surroundings on Earth to form a synergistic and self-regulating, complex system that helps to maintain and perpetuate the conditions for life on the planet.

  4. Musical system of ancient Greece - Wikipedia

    en.wikipedia.org/wiki/Musical_system_of_ancient...

    (Half-sharp and double-sharp notes not used with the depicted notes are omitted.) Depiction of the ancient Greek tonal system The central three columns of the diagram show, first the modern note-names, then the two systems of symbols used in ancient Greece: the vocal symbols (favoured by singers) and instrumental symbols (favoured by instrument ...

  5. Music and mathematics - Wikipedia

    en.wikipedia.org/wiki/Music_and_mathematics

    Music theory analyzes the pitch, timing, and structure of music. It uses mathematics to study elements of music such as tempo, chord progression, form, and meter. The attempt to structure and communicate new ways of composing and hearing music has led to musical applications of set theory, abstract algebra and number theory .

  6. Musica universalis - Wikipedia

    en.wikipedia.org/wiki/Musica_universalis

    The musica universalis (literally universal music ), also called music of the spheres or harmony of the spheres, is a philosophical concept that regards proportions in the movements of celestial bodies —the Sun, Moon, and planets —as a form of music. The theory, originating in ancient Greece, was a tenet of Pythagoreanism, and was later ...

  7. Theory of relativity - Wikipedia

    en.wikipedia.org/wiki/Theory_of_relativity

    Special relativity is a theory of the structure of spacetime. It was introduced in Einstein's 1905 paper "On the Electrodynamics of Moving Bodies" (for the contributions of many other physicists and mathematicians, see History of special relativity). Special relativity is based on two postulates which are contradictory in classical mechanics:

  8. Musical acoustics - Wikipedia

    en.wikipedia.org/wiki/Musical_acoustics

    Musical acoustics or music acoustics is a multidisciplinary field that combines knowledge from physics, [ 1 ][ 2 ][ 3 ] psychophysics, [ 4 ] organology [ 5 ] (classification of the instruments), physiology, [ 6 ] music theory, [ 7 ] ethnomusicology, [ 8 ] signal processing and instrument building, [ 9 ] among other disciplines.

  9. Philosophy of music - Wikipedia

    en.wikipedia.org/wiki/Philosophy_of_music

    Philosophy of music is the study of "fundamental questions about the nature and value of music and our experience of it". [1] The philosophical study of music has many connections with philosophical questions in metaphysics and aesthetics. The expression was born in the 19th century and has been used especially as the name of a discipline since ...