Lee Mark Ranaldo is an American guitarist, singer and songwriter, best known as a co-founder of the rock band Sonic Youth. In 2004, Rolling Stone ranked Ranaldo at number 33 on its "Greatest Guitarists of All Time" list. In May 2012, Spin published a staff-selected top 100 guitarist list, ranking Ranaldo and his Sonic Youth bandmate Thurston Moore together at number 1.

Sonic Youth was an American rock band based in New York City and formed in 1981. Founding members Kim Gordon, Thurston Moore and Lee Ranaldo remained together for the entire history of the band, while Steve Shelley (drums) followed a series of short-term drummers in 1985, rounding out the core line-up. Jim O'Rourke was also a member of the band from 1999 to 2005, and Mark Ibold was a member from 2006 to 2011.