Nick Mason: tape effects and editing
Rick Wright: keyboards, vocals, VCS-3, Synthi-A
Chris Adamson, Jerry Driscoll: spoken words and laughter
Clare Torry: vocals

Nick Mason made this instrumental introduction to Dark Side of the Moon using loops from other songs on the album and responses to questions about insanity and death. These questions were put to various people around Abbey Road at the time. Curiously enough, Paul and Linda McCartney were among the interviewed, although their responses weren't interesting enough to make the cut. The only reason "Speak to Me" is really considered a separate song and not just an introuction to "Breathe" is Nick Mason's desire to have a publishing credit on the album.