The use of three different clefs makes it possible to write music for all instruments and voices, regardless of differences in tessitura. Because the modern stave has only five lines, it is not possible to represent all pitches playable by the orchestra with only one clef, even with the use of ledger lines. The use of different clefs for various instruments and voices allows each part to be written comfortably on the stave with a minimum of ledger lines. To this end, the G-clef is used for high parts, the C-clef for middle parts, and the F-clef for low parts—with the notable exception of transposing parts, which are written at a pitch different from their sound, often even in a different octave.
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