Alto clef
The alto clef is a C clef centred on the middle line of the staff, which it makes middle C. Viola music is written in it.
How to read it
The C clef can sit on different lines, and wherever it sits, the line through its centre is middle C. On the middle line it is the alto clef. Richardson’s Elements of Music (1893) gives the alto clef for the viola and the alto trombone, and for contralto and counter-tenor voices; the tenor clef, the same sign on the fourth line, is for the tenor trombone and the higher notes of the cello and bassoon.
Also searched as: C clef, viola clef.
Other positions
On the fourth line the same sign is the tenor clef; on the first line, the soprano clef. Karl Gehrkens (1914) wrote that the movable C clef, “formerly in very common use”, was then used only in parts for some orchestral instruments and, less and less, for the tenor part in vocal music.
Where the shape comes from
The sign is an altered letter C. Stainer and Barrett’s dictionary (1898) says that C and F were the letters most used as clefs in church music up to the time of Palestrina.
More music symbols
Sources
- Music Notation and Terminology, Karl W. Gehrkens, 1914, A. S. Barnes Company (Project Gutenberg), Chapter II, §17
- Primer of Facts about Music, M. G. Evans, 1909, Theodore Presser Co. (Internet Archive, University of Toronto), Q. 22
- Stainer and Barrett's Dictionary of Musical Terms, John Stainer and W. A. Barrett, new and revised edition, 1898, Novello (Internet Archive, Cornell University Library), Alto clef; Clef
- Elements of Music, Harmony, and Musical Form, M. I. Richardson, 1893, Rivington, Percival & Co. (Internet Archive, University of Illinois), Part I, Chapter I, §14–15
- SMuFL: Clefs, Standard Music Font Layout, glyph table U+E050–U+E07F, W3C Music Notation Community Group, U+E05C
Last reviewed September 26, 2026 by Rory Hansen. How we research