Insert articles where necessary. pay attention to the capitalization. 1. prominent musician of 20th century u. hajibeyov brought mugham into opera azerbaijani people have very rich musical art and culture 3.m. jackson was american musician. he was most successful 4. r.behbudov organized first dong theatre in azerbaijan in 1965 please help me

1. The prominent musician of the 20th century U. hajibeyov brought the mugham into an opera.
2. The Azerbaijani people have a very rich musical art and culture.
3. M. Jackson was an american musician. He was the most successful.
4. R.behbudov organized the first dong theatre in Azerbaijan in 1965.