Classical: is a term that has two different meanings when it comes to music. In the broadest sense, classical music refers to music of certain forms and genres (symphony, string quartet, sonata, etc.) for certain instrumental combinations (solo violin, symphony orchestra, string quartet, etc) and intended for concert performance.

In a narrower sense "classical" refers to a specific period in music history and a specific set of stylistic traits. This is the dominant music style of the late 18th century in Europe as exemplified by the music of Haydn, Mozart, and the young Beethoven. The hallmarks of this style are balance, clarity, and proportion. These qualities reflect  the artistic sensibilities of of ancient Greece and Rome, the so-called "Classical" civilizations.