Theory:

     Tansen was ten years old when he went away with Swami Haridas. He lived with him for eleven years, learning music, and became a great singer. At about this time, his parents died. Mukandan Misra’s dying wish was that Tansen should visit Mohammad Ghaus of Gwalior. Mohammad Ghaus was a holy man. Mukandan Misra had long been devoted to him, and often visited him. While living in Gwalior with Mohammed Ghaus, Tansen was often taken to the court of Rani Mrignaini, who was a great musician herself. There he met and married one of the ladies of the court. Her name was Hussaini.
Explanation:
 
Swami Haridas convinced Tansen's father to take Tansen along to make him a good singer. Though Tansen was his only child, he decided to send Tansen with Swami Haridas for learning music. Tansen was just ten years old at that time. Then, he spent eleven years with Swami Haridas and learnt music from him. His continuous practise made him a great singer.
  
The great singer Tansen.jpg
The great singer Tansen
 
Unfortunately, about this time, Tansen's parents died. Tansen's father, Mukandan Misra, had a dying wish. He wanted his son Tansen to visit Mohammad Ghaus of Gwalior. Mohammad Ghaus was a holy man. Tansen's father, when alive, visited him frequently as he was a great devotee of Mohammad Ghaus.
 
Tansen stayed along with Mohammad Ghaus as wished by his father. Around this time, Tansen was often taken to the court of Rani Mrignaini. Rani Mrignaini was a great musician herself. During his frequent visits to the court of Rani Mrignaini, he met a lady named Hussaini, one of the ladies of the court, and married her.
  
Meaning of difficult words:
 
S. No
Words
Meaning
1.
Court
A king's household
2.
Frequent
Happening or doing something often
3.
Devoted
Extremely loving and loyal to something  or someone
Reference:
National Council of Educational Research and Training (2006). Tansen (pp. 15-19). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.