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The alto recorder in F, also known as a treble (and, historically, as consort flute and common flute) is a member of the recorder family. Up until the 17th century the alto instrument was normally in G4 instead of F4.[1] Its standard range is F4 to G6.
The alto is between the soprano and tenor in size, and is correspondingly intermediate in pitch. It has the same general shape as a soprano, but is larger in all dimensions, resulting in a lower pitch for a given fingering.
The F alto is a non-transposing instrument, though its basic scale is in F, that is, a fifth lower than the soprano recorder and a fourth higher than the tenor (both with a basic scale in C). So-called F fingerings are therefore used, as with the bassoon or the low register of the clarinet, in contrast to the C fingerings used for most other woodwinds. Its notation is usually at sounding pitch, but sometimes is written an octave lower than it sounds.