Simplify the following text for a Grade 7 native English-speaking person.
Original: Mats SÃ derlund ( better known by his stage name , GÃ 1\/4 nther ) is a Swedish Europop\/Eurodance singer and songwriter .
Simplified: Mats SÃ derlund is a Swedish musician , best known under his stage name GÃ 1\/4 nther , who began his career in 2004 .