A Sphere in the Heart of Silence is a studio album by John Frusciante and Josh Klinghoffer, released on November 23, 2004 onRecord Collection. The fifth in a series of six releases Frusciante issued, from June 2004 to February 2005, the album is composed mainly of electronica-based material.
Frusciante notes, "It's electronic music, but much more raw. We recorded this the same way we did Inside of Emptiness - with all the out-of-control qualities that I've been building toward with my style of playing and recording - but we used electronic instruments. There are some techno things with punk-rock-type screaming vocals. It's only a seven-song album, but it's, like thirty-eight minutes long."