The guitar Kurt Cobain played on Nirvana's 1993 "MTV Unplugged" performance sold for an eye-popping $6 million at auction. The 1959 Martin D-18E that Cobain played was sold to Australian Peter Freedman, owner of Røde Microphones, at the Music Icons event. The bids opened at $1 million for the sale that ended up breaking several world records. Cobain used it to play tunes, including "About a Girl" and "All Apologies," at the November 18, 1993 show in New York. He died less than five months late at 27. A day earlier, at the same auction event, a custom guitar played by Prince sold for $563,500.