Instruments
An instrumental extension is a range of playable notes outside the normal range of the instrument. A baritone horn, if played by a skillful player, can be played an octave above the normal range. Since this isn't standard, these notes would be an extension. See also: Crook (music). With the bowed string instruments, lower pitches than the standard range are sometimes used through scordatura in which the lowest string is tuned down a note or two. The double bass sometimes uses a C extension extending the range of the E string downwards to C. Some Bösendorfer pianos have extra keys, extending the range several notes lower than a standard 88-key piano.
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