Simplify the following text for a Grade 5 native English-speaking person.
Original: Corey Todd Taylor ( born December 8 , 1973 ) sometimes known by his number 8 , is an American musician best known as the lead vocalist and songwriter of Slipknot and Stone Sour .
Simplified: Corey Taylor ( born December 1973 ) also known by his number # 8 , is an American singer . He is the lead singer of the bands Slipknot and Stone Sour .