Simplify the following text for a Grade 8 native English-speaking person.
Original: A `` second wave '' arose in the early 1990s , spearheaded by Norwegian bands such as Mayhem , Burzum , Darkthrone , Immortal and Emperor .
Simplified: Second wave is the most popular wave of black metal and it started in the early 1990s . It started from Norway and includes bands such as Darkthrone , Enslaved , Burzum , Satyricon , Mayhem , Gorgoroth , Immortal , and Emperor .