Simplify the following text for a Grade 4 native English-speaking person.
Original: In 2006 , after end of the Idol season , he released his first single , a cover of '' Ã -- ppna din dÃ rr '' , a song by Tommy Nilsson .
Simplified: Ã -- ppna Din DÃ rr '' ' ( Tommy Nilsson cover ) peaked at No. 24 in 2006 and Tokyo ( credit to Danny ) was two weeks at No. 1 in 2007 .