In music, "classical" has two meanings. The generalized term, "Classical Music" denotes art music composed for performance, as opposed to popular songs, rock, or theater music. The more specialized meaning, within the larger category of Classical Music, denotes symphonies or other types of music composed in the mid- to late-18th century through the early 19th, by Haydn, Mozart, early Beethoven and their contemporaries, known as the "classical period". Alternately, "classic" can just mean a favorite or standard for many years, like classic rock, classic bluegrass, etc.