Hmm...Bollywood, how do describe...
Bollywood is the informal term popularly used for the Hindi-language film industry based in Mumbai, Maharashtra, India. The term is often incorrectly used to refer to the whole of Indian cinema; it is only a part of the total Indian film industry, which includes several regional film industries sorted by language. Bollywood is the largest film producer in India and one of the largest centers of film production in the world.
Bollywood is formally referred to as Hindi cinema, though frequent use of poetic Urdu words is fairly common. There has been a growing presence of Indian English in dialogue and songs as well. It is not uncommon to see films that feature dialogue with English words and phrases, or even whole sentences.
Bollywood started sound in movies with Alam-Ara.
In India, Non-Film music is hardly popular because of the fact that movies usually have 5 or more songs in them.
[Information from Wikipedia]