Editing Clef (section)

===Octave clefs===
[[File:Tenorclefs.png|thumb|left|200px|Three types of suboctave treble clef showing middle C]]
[[File:C scale treble sub-octave clef.png|thumb|C major scale, suboctave clef. {{audio|Diatonic scale on C bass clef.ogg|Play}}]]
[[File:C scale sopranino clef.png|thumb|C major scale, "sopranino" clef. {{audio|Diatonic scale on C sopranino clef.ogg|Play}} (this is one octave higher than the treble clef without an 8)]]

Starting in the 18th century, music for some instruments (such as [[guitar]]) and for the tenor voice have used treble clef, although they sound an octave lower. To avoid ambiguity, modified clefs are sometimes used, especially in [[choir|choral]] writing. Using a C-clef on the third space places the notes identically, but this notation is much less common<ref>There was a vogue in 20th-century Oliver Ditson Co. editions, for example ''Master Choruses'' selected by Smallman & Matthews (Boston 1933)</ref><ref>This notation is also used in the 1985 ''Hymns of the Church of Jesus Christ of Latter-day Saints'' for many of the men's arrangements, i.e. Hymns [https://www.churchofjesuschrist.org/music/library/hymns/rise-up-o-men-of-god-mens-choir?lang=eng&showFlash=false 323] and [https://www.churchofjesuschrist.org/music/library/hymns/see-the-mighty-priesthood-gathered-mens-choir?lang=eng&showFlash=false 325–337]</ref> as it is easily confused with the [[#Alto clef|alto]] and [[#Tenor clef|tenor clefs]].

Such a modified treble clef is most often found in tenor parts in [[SATB]] settings, using a treble clef with the numeral ''8'' below it. This indicates that the pitches sound an octave lower. As the true tenor clef has fallen into disuse in vocal writings, this "octave-dropped" treble clef is often called the tenor clef. The same clef is sometimes used for the [[octave mandolin]]. This can also be indicated with two overlapping G-clefs.

Tenor banjo is commonly notated in treble clef. However, notation varies between the written pitch sounding an octave lower (as in guitar music and called octave pitch in most tenor banjo methods) and music sounding at the written pitch (called actual pitch). An attempt has been made to use a treble clef with a diagonal line through the upper half of the clef to indicate octave pitch, but this is not always used.

To indicate that notes sound an octave higher than written, a treble clef with an ''8'' positioned above the clef may be used for [[penny whistle]], [[Recorder (musical instrument)#Sheet music notation|soprano and sopranino recorder]], and other high woodwind parts. A treble clef with a ''15'' above (sounding two octaves above the standard treble clef) is used for the [[garklein recorder|garklein (sopranissimo) recorder]].

An F-clef can also be notated with an octave marker. While the F-clef notated to sound an octave lower can be used for contrabass instruments such as the [[double bass]] and [[contrabassoon]], and the F-clef notated to sound an octave higher can be used for the bass recorder, these uses are extremely rare. In Italian scores up to [[Gioachino Rossini]]'s [[William Tell Overture|Overture to ''William Tell'']], the cor anglais was written in bass clef an octave lower than sounding.<ref>Del Mar 1981, 143.</ref> The unmodified bass clef is so common that performers of instruments whose ranges lie below the staff simply learn to read ledger lines.
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