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A violotta is a tenor viola (or tenor violin) invented by the German luthier Alfred Stelzner and patented in 1891. It is tuned G2-D3-A3-E4, an octave below the violin. Other instruments called "tenor violin" were tuned a step lower: F2-C3-G3-D4 (a fifth below the viola).
It is rarely used by composers. One of the few works where it is used is the String Quintet in A by Felix Draeseke. It is also used in Max von Schillings' opera Der Pfeifertag (1899), and in Sergei Taneyev's String Trio in E♭ major, Op. 31 (1911).