sentences:  He also wrote a set of "Bagatelles", Op.47, for the unusual instrumentation of two violins, cello, and harmonium, two waltzes for string quartet, and a set of 12 love songs arranged for quartet, taken from his set of 18 songs originally composed in 1865 entitled "Cypresses".In a 1904 interview, Dvořák claimed that opera was 'the most suitable form for the nation'.