The period marked by balance and the sonata form is the Classical period. This period, which lasted from the mid-18th to early 19th century, is characterized by a focus on clarity, symmetry, and balance in music composition. The sonata form, a structure commonly used in symphonies, sonatas, and concertos, was developed and perfected during this time. Composers such as Mozart and Haydn were prominent figures of the Classical period, known for their use of this form and their pursuit of balance and order in their compositions.