Classical music is hard to define in specific terms, but it is generally understood to be music rooted in Western European traditions performed by trained musicians in formal settings like concert halls, opera houses, and churches. Its key emphasis is the faithful interpretation of composers' written scores. Classical music's roots lie in the chant melodies of Medieval religious rites. Its contemporary incarnation encompasses everything from opera and the symphony orchestra to chamber ensembles, solo works, choral music, songs, film music, and the avant-garde. Works from the intervening centuries make up the bulk of the recorded repertory, and they mirror the artistic and architectural trends of the Renaissance, Baroque, Classical, Romantic, and Modern eras in their sound worlds and conception. The dichotomy between classical and popular music is a fairly recent cultural development. In fact, much of what is considered classical music today grew out of, was influenced by, or was popular music of its time.