In the early '90s, no couple in rock was more notorious than Kurt Cobain and Courtney Love. The tabloid circus that followed them wearied Cobain's bandmates in Nirvana, and that tension only grew worse after Cobain's untimely death in 1994. For the next 20 years, Courtney and Nirvana's former drummer and current Foo Fighter, Dave Grohl, engaged in a war of words in songs and Howard Stern interviews. In the process, cultural institutions like Guitar Hero and The Muppets were dragged into the melee.

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