| Just guitar and bass. Piano, most voices and most instruments all read the same. For example, a bass's low E is written on the first line below the staff. A piano player would interpret that note as having a second-fret E's pitch. The same goes for the guitar. In guitar music, the first line below the staff is a third-fret C (an octave below middle C). Pianists, violinists, sopranos, and altos, would play middle C, found at a guitar's first fret, B string. Tenors read bass clef at pitch, but tenor music is also often found written in treble clef, with an understood octave down shift.
Technically, the correct way to indicate that a part should be played "ottava basso" (an eighth below, in Italian) is to write a little 8 attached to the bottom of the clef, but much of the time it is omitted and understood.
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--Paul Donnelly
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