In music, extended technique is unconventional, unorthodox, or non-traditional methods of singing or of playing musical instruments employed to obtain unusual sounds or timbres.
A prepared guitar, in which various metal objects have been inserted between the strings and the neck.
John Milton Cage Jr. was an American composer and music theorist. A pioneer of indeterminacy in music, electroacoustic music, and non-standard use of musical instruments, Cage was one of the leading figures of the post-war avant-garde. Critics have lauded him as one of the most influential composers of the 20th century. He was also instrumental in the development of modern dance, mostly through his association with choreographer Merce Cunningham, who was also Cage's romantic partner for most of their lives.
Cage in 1988
John Cage (left) and Michael Bach in Assisi, Italy, 1992
Variations III, No. 14, a 1992 print by Cage from a series of 57
John Cage