[56a]
which are commonly called arts and acquire their efficacy by practice and toil.
Protarchus
That is undeniable.
Socrates
Take music first; it is full of this; it attains harmony by guesswork based on practice, not by measurement; and flute music throughout tries to find the pitch of each note as it is produced by guess, so that the amount of uncertainty mixed up in it is great, and the amount of certainty small.
Protarchus
Very true.