The Rickenbacker 4001 is part of Rickenbacker's 4000 series of bass guitars. The 4001 was produced from 1961 through 1981. Many artists, including Kurt Cobain, Cliff Burton, and Geddy Lee used Rickenbacker 4001 Basses. The 4001 has a tone that is distinct from any other basses. It has the classic Rickenbacker versatility; from a deep, dark, clear punch to a snarly growl.