The guitar that Kurt Cobain played on “MTV Unplugged” in 1993 just sold . . . for $6 MILLION! The price broke the world records for Most Expensive Guitar, Most Expensive Memorabilia, World’s Most Expensive Acoustic Guitar, and obviously the World’s Most Expensive Nirvana Memorabilia Sold at Auction. Cobain’s daughter Frances used to own the guitar, but lost it to her ex-husband in their divorce settlement. Frances and her mom Courtney Love tried to get it back, but were denied.