What does alto clef mean in music?

Notation & reading

Alto clef

Also: viola clef, C clef

Alto clef is a C clef that places middle C on the middle line of the staff, and it is the standard clef for the viola.

The C clef is movable, and where its centre points is where middle C sits. Placed on the third line it is alto clef; placed on the fourth it is tenor clef. Alto clef exists because the viola's range falls awkwardly between treble and bass, written in either, most viola music would sit on ledger lines. Alto clef keeps it on the staff.

The line notes are F, A, C, E, G from bottom to top, and the spaces are G, B, D, F. The single most important habit for a new violist is learning these as their own set rather than transposing from treble clef; the transposition trick works for a few weeks and then permanently limits reading speed.

Alto clef also appears occasionally in trombone and bassoon parts, and in older orchestral scores for other instruments.

Tenor clef: Tenor clef is a C clef placing middle C on the fourth line of the staff, used for the higher register of cello, bassoon, and trombone parts.
Treble clef: Treble clef is a G clef that places the G above middle C on the second line of the staff, and it is the clef used for violin and for the upper register of viola.
Bass clef: Bass clef is an F clef placing the F below middle C on the fourth line of the staff, and it is the primary clef for cello and double bass.
Ledger line: A ledger line is a short line written above or below the staff to extend it, allowing notes outside the five-line range to be notated.

Every term in this glossary is taught in context somewhere in Arco's curricula, on the staff, on the keyboard, and on your own fingerboard at the same time.

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