Use of " used to" (my artist favorite)

Hello my friends and teacher!!
Welcome to my Blog of English!!
This my first homework.

Ramón Luis Ayala Rodríguez was born in San Juan, Puerto Rico, on 3th February 1977.
Now known as Daddy Yankee. Be the meaning of his name Big Daddy, because in Puerto Rico Yankee denotes something big and strong.
It´s singer of reggaeton and film producer.
He has worked with top artists as Snoop Dogg, Fergie, 50 Cent, Eminem, Ricky Martin and much more.

Used to singe topics of Hip-hop and reggae, having twelve years old.
Used to have sobriquets as Cangri, Cash, 30-30 and more.
Used to improvise rhymes.