A set of forty études for this instrument were written by David Popper and are titled High School of [this instrument] Playing. The most perfect performer of this instrument was Pierre Fournier. The last movement of Brahms's Opus 38, a duo-sonata for this instrument in E minor, quotes a theme from Art of Fugue and combines elements of the fugue and sonata. Brahms's Opus 99, often paired with Opus 38, is another sonata for this instrument, except in F major, that oddly, for Brahms, features tremolando playing in the piano. A concerto for this instrument establishes the key of (*) E minor by unusually opening with a four bar recitative for the soloist. That concerto is extremely associated with Jacqueline Du Pré's interpretation and was composed by Elgar. For 10 points, name this string instrument that's deeper pitched than the viola and violin and which is played 
A set of forty études for this instrument were written by David Popper and are titled High School of [this instrument] Playing. The most perfect performer of this instrument was Pierre Fournier. The last movement of Brahms's Opus 38, a duo-sonata for this instrument in E minor, quotes a theme from Art of Fugue and combines elements of the fugue and sonata. Brahms's Opus 99, often paired with Opus 38, is another sonata for this instrument, except in F major, that oddly, for Brahms, features tremolando playing in the piano. A concerto for this instrument establishes the key of (*) E minor by unusually opening with a four bar recitative for the soloist. That concerto is extremely associated with Jacqueline Du Pré's interpretation and was composed by Elgar. For 10 points, name this string instrument that's deeper pitched than the viola and violin and which is played by Yo-Yo Ma.
A set of forty études for this instrument were written by David Popper and are titled High School of [this instrument] Playing.
violincello