Several factors contributed to grunge's decline in prominence. During the , many grunge bands broke up or became less visible. Nirvana's Kurt Cobain, labeled by "Time" as "the John Lennon of the swinging Northwest", appeared unusually tortured by success and struggled with an addiction to heroin before his death at the age of 27 in 1994. Although most grunge bands had disbanded or faded from view by the late 1990s, they influenced modern rock music, as their lyrics brought socially conscious issues into pop culture and added introspection and an exploration of what it means to be true to oneself. Grunge was also an influence on later genres such as post-grunge (such as Creed and Nickelback) and nu metal (such as Korn, Limp Bizkit, and Slipknot).