of Op. 96, Dvořák composed his E-flat Major String Quintet, Op. 97. This piece was distinguished from his prior chamber works due to the instrumentation of two viola parts. The influence that Native American folk music had on Dvořák's work was also apparent in Op. 97; there is a common drum rhythm in Native American music presented throughout all of the movements except the Larghetto. Other chamber works He also composed two piano quintets, both in A major, of which the second, Op. 81, is the better known. He left a Terzetto for two violins and viola (Op. 74); two piano quartets (Op. 23 and Op. 87), a string sextet, Op. 48; and four piano trios, including the Piano Trio No. 4 (subtitled Dumky), Op. 90. He also wrote a set of Bagatelles, Op. 47, for the unusual combination of two violins, cello, and harmonium. The Bagatelles are cyclical and similar to a suite, echoing Czech bagpipe melodies. Dvořák wrote two waltzes for string quartet, and arranged set of 12 love songs for the string quartet entitled Echo of Songs (B152), taken from his set of 18 songs originally composed in 1865 entitled Cypresses. His works for violin and piano include the Romantic Pieces, the Violin Sonatina, and the Violin Sonata. Operas In a 1904 interview, Dvořák claimed that opera was 'the most suitable form for the nation'. If this nationalist sentiment was at the heart of his opera compositions, he struggled to find a style straddling Czech traditional melody and the grand opera style of Giacomo Meyerbeer, which he experienced as lead viola player in the orchestra of Prague's Provisional Theatre between 1862 and 1871, and whose influence is evident in his works such as Vanda and Dimitrij. His later interest in the music of Richard Wagner also influenced his operas, evident in his extensive rewrite of Dmitrij in 1894, following its failure at Vienna. Of all his operas, only Rusalka, Op. 114, which contains the well-known aria "Měsíčku na nebi hlubokém" ("Song to the Moon"), is played on contemporary opera stages with any frequency outside the Czech Republic. This is attributable to their uneven invention and libretti, and perhaps also their staging requirements – The Jacobin, Armida, Vanda and Dimitrij need stages large enough to portray invading armies. There is speculation by Dvořák scholars such as Michael Beckerman that the second movement of his Symphony No. 9 "From