9 Big Music Feuds

One of the songs on Taylor Swift's hugely popular 1989 is reportedly about Katy Perry—"Bad Blood," which includes the lyrics "Did you think we'd be fine? / Still got scars on my back from your knife," is rumored to be about Perry "stealing" three backup dancers from Swift, and Perry apparently responded by tweeting, "Watch out for the Regina George in sheep’s clothing," a Mean Girls reference. But that's far from the biggest music feud of all time—Radar rounds up 22 more. A sampling:

• Lil' Kim has accused Nicki Minaj of copying her—and earlier this year, Lil' Kim went so far as to release "Identity Theft," a song that includes the line, "Anything you tryna do, I done did it."
• And Minaj also had a beef with Mariah Carey when they were both American Idol judges, with Minaj once saying, "I told them, I’m not f---ing putting up with her f---ing highness over there" and Carey reportedly hiring extra security in response.

• Madonna once called Lady Gaga's "Born This Way" "reductive," after many people said it sounded like Madonna's "Express Yourself." Then, this year, Gaga hit back at Madge, saying, "If I was an established artist, I would love to help younger artists."
• After Chris Brown performed at the Grammys three years after beating Rihanna before the 2009 awards, Miranda Lambert tweeted, "I don’t get it. He beat on a girl..." Brown tweeted in response, "Using my name to get publicity? I love it!"
• For being America's Sweetheart, Swift sure has been involved in her fair share of feuds. After she allegedly wrote "Dear John" about her relationship with John Mayer, Mayer said he "didn't deserve it" and called it "a really lousy thing for her to do."
• Back in 1995, Blur and Oasis were rivals, even releasing competing singles on the same day. Noel Gallagher once said that he hoped two Blur members would "catch AIDS and die."
• Ciara told E! back in 2011 that she ran into Rihanna at a party and "she wasn't the nicest person," and their feud continued for years. Last year, Rihanna tweeted about Ciara, "Why am I still the main topic of her interviews!!"
• Courtney Love was in a two-decade feud with former Nirvana member Dave Grohl that had to do with the management of the band's business dealings, but they reconciled this year.

Click for the complete list, including one feud that involves ... naked boobs. (More Taylor Swift stories.)