Beethoven's music connected the Classical and Romantic eras through stylish innovations such as the harmonic terms and structure used.

The term classical music refers to a broad period in Western music that includes the Baroque and Romantic eras.

The classical historical period through socio-religious-cultural transition when norms and rules were formulated in epistomology,logic,rhetorics,literature ,art,music,dance etc.

The Greek period were one of the eras.

Classical music is a broad term of music of the western culture. It is a combination of the Western Art music that began in the Medieval period, typically called the common practice period, and most regional musical styles and genres. It is the music of the Baroque, Classical, and Romantic eras, particularly the 18th and 19th centuries. Some of the main genres of classical music are symphonies, concertos, sonatas, chamber music and solo instrumental performances.

Classical-Romantic

This included the transitional phase between these two eras. Classical music is simply elegant and romantic music is dramatic and deep. Beethoven was one of the main composers in this transition.