Classical music and Neoclassical architecture developed both during the second half of the 18th century. They are characterized by their 'simplicity'. In addition, both of them went against movements such as Baroque and Rococo, which are identified by their use of ornaments, impressive grandeur and extravagance.
Classical music and Neoclassical architecture emphasized elegance. Classical music was mainly homophonic and used a clear melody line. Furthermore, the main instrument during this period was the piano, which contributed to give music a lighter texture than the music of the previous period. Neoclassical architecture also went against the Rococo style by emphasizing the planar qualities of the buildings instead of focusing on their sculptural volumes. Furthermore, its use of light and shade was considerably smoother than the use of light and shade of the Baroque architecture.
In that way, Classical music and Neoclassical architecture share a clear form and a refined style and they were both famous movements at an international level during the second half of the 18th century.
