Polyphony and monophony in instruments harpejji and the Chapman stick). Multiphonics can be used with many regular wind instruments to produce two or more notes at once, although this is considered an extended technique. Explicitly polyphonic wind instruments are relatively rare, but do exist. The standard harmonica can easily produce several notes at once. Multichambered ocarinas are manufactured in a number of varieties, including double, triple, and quadruple ocarinas, which use multiple chambers to extend the ocarina's otherwise limited range, but also enable the musician to play more than one note simultaneously. Harmonic ocarinas are specifically designed for polyphony, and in these instruments the range
The Double Hook hook twice the fear." Watson wrote "The Double Hook" between 1952 and 1954 in Calgary, Alberta and revised it during a year spent in Paris. Throughout the 1950s she was unable to find a publisher. "T.S. Eliot at Faber & Faber, C. Day-Lewis at Chatto & Windus, and Rupert Hart-Davis all turned it down." McClelland & Stewart optioned the book in Canada, largely on the strength of a covering letter by Fred Salter of the University of Alberta calling it "the most brilliant piece of fiction ever written in Canada." To decide on publication, though, the company sought the opinion