Leopold Mozart, A Treatise on the Fundamental Principles of Violin Playing, 1756

"It is a distinctive kind of fiddle which sounds especially charming in the stillness of the evening. Above, it is strung with six gut strings of which the lower three are covered (i.e., are wire-wound like most modern strings), while below the fingerboard are stretched six steel strings, which are neither plucked nor bowed but are there merely to duplicate and prolong the sound of the upper strings."