The characteristics of Classical music are:
 ~ tuneful melodies
 ~ more flexibility of rhythm
 ~ basically homophonic
 ~ clarity of structure in musical form
 ~ greater variety and contrast of mood

Variety and contrast within a piece became more pronounced than before. Variety of keys, melodies, rhythms and dynamics (using crescendo,diminuendo and sforzando), along with frequent changes of mood and timbre were more commonplace in the classical period than they had been in the baroque. Melodies tended to be shorter than those of baroque music, with clear-cut phrases and clearly marked cadences. The orchestra increased in size and range; the harpsichord continuo fell out of use, and the woodwind became a self-contained section. As a solo instrument, the harpsichord was replaced by the piano (or fortepiano). Early piano music was light in texture, often with Alberti bass accompaniment, but it later became richer, more sonorous and more powerful. 

Importance was given to instrumental music—the main kinds were sonata, trio, string quartet, symphony, concerto, serenade and divertimento. Sonata form developed and became the most important form. It was used to build up the first movement of most large-scale works, but also other movements and single pieces (such as overtures).