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Experimental music, or Avant-garde music, is any music that challenges the commonly accepted notions of what music is. John Cage was a pioneer in experimental music and defined and gave credibility to the form.

As with other edge forms that push the limits of a particular form of expression, there is little agreement as to the boundaries of experimental music, even amongst its practitioners. On the one hand, some experimental music is an extension of traditional music, adding unconventional instruments, modifications to instruments, noises, and other novelties to orchestral compositions. At the other extreme, there are performances that most listeners would not characterize as music at all.

Some of the more common tricks and techniques include:

• "Prepared" instruments. Ordinary instruments are modified in their tuning or sound-producing characteristics. For example, guitar strings can have a weight attached at a certain, changing their harmonic characteristics.
• Unconventional playing techniques. For example, strings on a piano can be plucked with a pick instead of played the intended way, or the tuning pegs on a guitar can be rotated while a note sounds (called a "tuner glissando").
• Incorporation of instruments or scales from non-Western musical traditions
• Use of sound sources other than musical instruments. Trash cans, telephone ringers, doors slamming.
• Playing with deliberate disregard for the ordinary musical controls (pitch, duration, volume), as when depressing as many piano keys as possible with the forearm
• Use of tunings or scales inconsistent with the Western chromatic scale

While much discussion of experimental music centers on definitional issues and its validity as a musical form, the most frequently performed experimental music is entertaining and, at its best, can lead the listener to question core assumptions about the nature of music.

See also:

• Contemporary music
• 20th century classical music
• Free jazz
• Free improvisation
• Noise music
• Electronic music
• Electronic art music
• Computer music
• Aleatoric music