The prepared piano provides chime-like sounds due to the screws inserted between the rings, and the opening tintinnabulation returns.
The term "prepared piano" refers to a piano whose sounds have been temporarily changed by the placement of bolts, screws, mutes, rubber erasers, and/or other parts on or between the strings. The dance music for Bacchanale by John Cage, which was composed without the use of a percussion ensemble, is typically credited as its inspiration.
Henry Cowell served as Cage's model for creating piano extended techniques, which involve manipulating the piano's strings rather than its keyboard. The Sonatas and Interludes are typical of Cage's style because each piano note has its own distinct tone and the primary pitch of the string may not always be discernible.
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