The Chennai Music Season is a major annual event celebrating:

Carnatic music
Tamil film music
Folk music
Western classical music

The correct answer is: a) Carnatic music.

Carnatic music is a classical music tradition from South India. It is one of the oldest surviving musical traditions in the world, and is known for its complex melodies and rhythms. The Chennai Music Season is a major annual event that celebrates Carnatic music. It is held in Chennai, India, from December to January, and attracts musicians and music lovers from all over the world.

Tamil film music is a genre of film music that is popular in Tamil Nadu, India. It is a fusion of Carnatic music, Western classical music, and folk music. Tamil film music is known for its catchy melodies and soulful lyrics.

Folk music is a genre of music that is typically passed down orally from generation to generation. It is often associated with a particular region or culture, and can be used to tell stories, express emotions, or celebrate important events.

Western classical music is a genre of music that originated in Europe in the Middle Ages. It is characterized by its complex melodies, harmonies, and rhythms. Western classical music is often divided into three main periods: the Baroque period (1600-1750), the Classical period (1750-1820), and the Romantic period (1820-1900).