What Do Tasto Solo, All’Ottava and All’Unisono Mean?
In this essay, I discuss the thoroughbass indications tasto solo (Italian, literally “single key”), all’ottava and all’unisono. Tasto solo indicates that the keyboard continuist should not provide chordal accompaniment but play only the continuo bass, though some sources also allow octave doubling in the right hand. All’ottava and all’unisono are synonymous, indicating doubling of the
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