Recorded live 29 April 1970 at the Fillmore West, San Francisco
, California. (Be careful not to confuse this set with the Floyd's studio appearance at KQED, which was videotaped earlier on the same day and which has been widely circulated.)
This show has been circulating for many years as an incomplete soundboard recording in excellent quality, missing the beginning of "Set the Controls for the Heart of the Sun" and all but the first minutes of "A Saucerful of Secrets". It has been one of the most bootlegged concerts in Pink Floyd's career, with many previous RoIOs released under real and fictitious dates (one of the most common claiming to be live at Winterland on 21 October 1970). However, Interstellar Encore trumped those earlier releases by interpolating a second source, recorded from the audience and also in excellent quality, that includes the full "A Saucerful of Secrets" and the previously-unknown encore, a powerful performance of "Interstellar Overdrive" (which gives this RoIO its title). Also included are some between-song conversations which were missing on earlier releases. Interstellar Encore does not, however, include the first half of "Set the Controls for the Heart of the Sun", which reportedly is on the audience source but suffers from severe tape speed problems.
Harvested Records has remastered this show, removing a chirping noise that plagues certain sections of the recording, and released it as Interstellar Fillmore. Other CDR releases of this show are numerous, and the complete "second source" (audience tape) is available in Pink Floyd trading circles, though hard to find.