A Sphere in the Heart of Silence is a collaborative studio album by John Frusciante and Josh Klinghoffer, released on November 23, 2004 on Record 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.

These reissued records are 180 gram and come with a download of choice between MP3 and WAV formats of the album.

All tracks are written by John Frusciante and Josh Klinghoffer