Roberto Sierra is considered to be today one of the leading American composers of his generation. In 1987 Sierra came to prominence when his first major orchestral composition, Júbilo, was performed at Carnegie Hall by the Milwaukee Symphony Orchestra. His works have been performed by the major orchestras of Philadelphia, Pittsburgh, Atlanta, Houston, Milwaukee, Minnesota, Dallas, Detroit, San Antonio and Phoenix, as well as by the American Composers Orchestra, the New York Philharmonic, the Los Angeles Philharmonic, the National Symphony Orchestra, the Kronos Quartet, Continuum, the Bronx Arts Ensemble, Voices of Change, England's BBC Symphony, Royal Scottish National Orchestra, and at Wolf Trap, the Santa Fe Chamber Music Festival, Festival Casals, Schleswig-Holstein Festival in Germany, France's Festival de Lille and others.
Recent commissions include Con madera, metal y cuero for Evelyn Glennie commissioned by the Los Angeles Philharmonic, the Royal Scottish National Orchestra and the Casals Festival (the premiere was part of the BBC 20th Century Retrospective "Sounding the Century"); Cuentos, commissioned by Camerata de las Américas; Cuatro Versos, a Cello Concerto commissioned by Carlos Prieto; Fanfarria, aria y movimiento perpetuo for violin and piano commissioned by the Library of Congress to celebrate Copland's centennial; Concerto for Orchestra for the centennial celebrations of the Philadelphia Orchestra commissioned by the Koussevitzky Music Foundation and the Philadelphia Orchestra; Fandangos for the National Symphony Orchestra In Washington DC; and Concerto for Saxophones and Orchestra for the phenomenal saxophonist James Carter, commissioned by the Detroit Symphony Orchestra. Recently the acclaimed guitarist Manuel Barrueco premiered a new concerto titled Folias with the New World Symphony.