In 2003, David Fricke of "Rolling Stone" ranked Cobain the 12th greatest guitarist of all time. He was later ranked the 73rd greatest guitarist and 45th greatest singer of all time by the same magazine, and by MTV as seventh in the "22 Greatest Voices in Music". In 2006, he was placed at number twenty by "Hit Parader" on their list of the "100 Greatest Metal Singers of All Time". In June 2020, the 1959 Martin D-18E acoustic-electric guitar used by Cobain for Nirvana's "MTV Unplugged" performance sold at auction for $6,010,000. It was the most expensive guitar and the most expensive piece of band memorabilia ever sold.