Many definitions of art have been proposed by philosophers and others who have characterized art in terms of mimesis, expression, communication of emotion, or other values.

Many contemporary definitions of " artist " and " art " are highly contingent on culture, resisting aesthetic prescription, in much the same way that the features constituting beauty and the beautiful, cannot be standardized easily without corruption into kitsch.

Many definitions tend to postulate or assume that complexity expresses a condition of numerous elements in a system and numerous forms of relationships among the elements.

Many unions are a blend of these two philosophies, and the definitions of the models themselves are still debated.

Many mass transit trains are built symmetrically with paired control booths, and definitions of forward, backward, left, and right are temporary.

Many definitions of philosophy begin by stating the difficulty of defining the subject, calling it " notoriously difficult ", saying that there is " no straightforward definition " and that most interesting definitions of philosophy are controversial.

Many of these definitions are not equivalent, resulting in different sets of objects being called polytopes.

Many order theoretical definitions for partially ordered sets can be generalized to preorders, but the extra effort of generalization is rarely needed.

Many of the terms associated with ragtime have inexact definitions, and are defined differently by different experts ; the definitions are muddled further by the fact that publishers often labelled pieces for the fad of the moment rather than the true style of the composition.

Many different definitions of standard reference conditions are currently being used by organizations all over the world.

Many definitions that describe a specific conformation ( IUPAC Gold Book ) exist:

Many definitions and images ( Visualizing Sustainability ) of sustainable development coexist.

Many developing countries are also quite liberal in their restrictions and definitions.

Many different definitions have been proposed — some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity.

Many definitions of essence hark back to the ancient Greek hylomorphic understanding of the formation of the things of this world.

Many definitions of the precautionary principle exist.

Many of the following notions also exist for not necessarily commutative rings, but the definitions and properties are usually more complicated.

Many tournaments meet both definitions ; for example, the Wimbledon tennis championship.

Many sociologists have pointed out the differences between definitions of a moral panic for American and British sociologists.

Many dictionary definitions include a reference to envy or envious feelings.

Many other definitions of attractor occur in the literature.

Many dictionaries, including Merriam-Webster, and Oxford, now include definitions in their publications defining it as such.

Many of Alcott's educational principles are still used in classrooms today, including " teach by encouragement ", art education, music education, acting exercises, learning through experience, risk-taking in the classroom, tolerance in schools, physical education / recess, and early childhood education.

Many Jews consider a portion of the 49-day period of the counting of the omer between Passover and Shavuot to be a time of semi-mourning and instrumental music is not allowed during that time.

Many Muslim musicians also perform a form of a cappella music called nasheed or Tawasheeh.

Many of these dance types are familiar from baroque music, perhaps most spectacularly in the stylized suites of J. S. Bach.

Many early forms of music and dance were created and performed together.

Many other languages have terms which only partly cover what Europeans mean by the term music ( Schafer ).

Many other director's cut music videos contain sexual content that can't be shown on TV thus creating alternative scenes, such as 30 Seconds to Mars's Hurricane, and in some cases, alternative videos, such as in the case of Spears ' 2008 video for Womanizer.

Many historic bands and early rock music recordings used this configuration, notable users including Ringo Starr in the Beatles, Mitch Mitchell in the Jimi Hendrix Experience, John Barbata in the Turtles and many others.

Many Asian civilizations distinguish between art / court / classical styles and " folk " music, though cultures that do not depend greatly upon notation and have much anonymous art music must distinguish the two in different ways from those suggested by western scholars.

Many churches today use contemporary worship music which includes a range of styles often influenced by popular music.

Many passages for solo harp can be found in 19th century ballet music, particularly in scores for the ballets staged for the Mariinsky Theatre of St. Petersburg, where the harpist Albert Zabel played in the orchestra.

Many harpsichords have a lid that can be raised, a cover for the keyboard, and a stand for music.

Many reasons have been cited for the obscurity of Western classical music in India, a country rich in its musical heritage by its own right, however the two main reasons are an utter lack of exposure and a passive disinterest in what is considered esoteric at best.

Many attempts to popularize Western classical music in India have failed in the past due to disinterest and lack of sustained efforts.

Many people in cultures which have notation still learn by ear and ear training, often through a musicianship course at a music conservatory or college, is common practice among those who use notation extensively.

Many of the band's songs dealt with themes of romance, unrequited love and sexual conquest, which were common in rock, pop and blues music.

Many such martial arts incorporate music, especially strong percussive rhythms.

Many of his students were artists working in other media with little or no background in music.

Many instrumental performers and singers, including a number of music celebrities, have learned " by ear ", especially in folk music styles such as blues and popular styles such as rock music.