1. Pertaining to, derived from, or founded on experiment: an experimental science.
2. Of the nature of an experiment.
Pro·gres·sive
1. Favoring or advocating progress, change, improvement, or reform, as opposed to wishing to maintain things as they are.
2. Making progress toward better conditions; employing or advocating more enlightened or liberal ideas, new or experimental methods, etc.
Experimental music is a term introduced by composer John Cage in 1955. Cage defined "an experimental action is one the outcome of which is unforeseen" and he was specifically interested in completed works that performed an unpredictable action. In a broader sense, it has come to mean any music that challenges the commonly accepted notions of what music is. There is an overlap with avant-garde music. David Cope describes experimental music as that, "which represents a refusal to accept the status quo" (Cope, 1997)
The "experiment" in this case is not whether a piece succeeds or fails, but is in the fact that the outcome of the piece is uncertain or unforeseeable. Some experimental music is an extension of traditional music, adding unconventional instruments, modifications to instruments, noises, and other novelties to compositions.
The term "experimental music" was used contemporaneously for electronic music, particularly in the early musique concrète work of Schaeffer and Henry in France and in the Experimental Studios at the University of Illinois, run by Lejaren Hiller.

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