For 10 points, name this instrument legendarily played by Brian Boru, a string instrument played upright.
A concerto for this instrument includes movements called "Estudiantina" and "Sarao." Besides Joaquin Rodrigo's Concierto serenata, Paul Hindemith wrote a sonata for this instrument for Clelia Gatti-Aldrovandi. Many conservatories use Glazunov's composition Une fantasie to audition players of this instrument, which plays Luciano Berio's second Sequenza. This instrument accompanies a chorus singing "Wolcom Yole!" and "This Little Babe" in Benjamin Britten's A Ceremony of Carols. Albert Zabel and Nicanor Zabaleta were virtuoso players of this instrument, which also plays the solo parts of Debussy's Sacred and Profane Dances. Schumann nicknamed the first of Chopin's Opus 25 etudes for its resemblance to the music of this instrument. Handel composed a B flat major concerto for this instrument for William Powell, and Mozart composed a double concerto for this instrument and ? flute. For 10 points, name this instrument legendarily played by Brian Boru, a string instrument played upright.
A concerto for this instrument includes movements called "Estudiantina" and "Sarao."
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