Tangerine Tree was a fan project operating from 2002 through 2006 with the goal of collecting, preserving and distributing unreleased concerts and other audio material by the band Tangerine Dream. The creators of the Tangerine Tree project received permission from Tangerine Dream to release the collection on a strict non-profit basis. Several of the Tangerine Tree volumes have been used as the basis for official Tangerine Dream releases. The project collected just under 300 hours of material (291:39:26).

Material was collected from audience recordings, soundboard recordings, recordings of radio and TV transmissions and in some cases the purchase of studio masters. Only recordings of a high quality and a unique nature were considered for the core Tangerine Tree volumes. These recordings were professionally re-mastered and released on CD-R and accompanied by high quality artwork for the CD labels and case liners.

Tangerine Leaves releases were based on material that did not meet the quality standards of the Tangerine Tree or from concerts that were not considered notable among a series of concerts. If a better source was found, a Tangerine Leaves volume might have been deprecated and replaced by a Tangerine Tree volume. Starting from 1980, the music played during each of the shows in a single Tangerine Dream concert tour were very similar, so it was impractical to release many volumes of the Tangerine Tree with similar content.

Audio DVD Tree volumes consisted of about two sets of the Tangerine Tree volumes on a DVD that played to a slideshow of the CD artwork. These releases were standard DVDs with a menu structure and were available in both PAL and NTSC versions.

History For almost four decades, much of this material had been traded on an informal basis and many were sold as bootlegs. Much was unidentified, misidentified, low quality and/or a multiple generation copy. Tapes were starting to degrade, as many were as much as forty years old. In the late 1990s, several collectors created the Digital Tape Tree project and distributed the material on CD-R. Collector Heiko Heerssen received permission from Tangerine Dream as long as there was no commercial gains from the project and on 9 January 2002 began to make appeals on the Tangerine Dream discussion group to gather all of the material together and create a formal project that would use the best available sources to provide the definitive version of each recording. A large number of previously unknown recordings were discovered and included in the project. All of the Digital Tape Tree volumes were replaced by later Tangerine Tree or Tangerine Leaves volumes.

In September 2002, before Tangerine Tree set three was released, an interim Classic Tree was established for distributing copies of non-remastered already-circulating bootlegs. All of the concerts used in the Classic Tree were subsequently released as Tangerine Tree volumes in superior quality, rendering the Classic Tree volumes and the bootlegs they represented obsolete.

When new sets were released, standard audio versions on CD-R were traded by signing up on the project home page on a "blanks and stamps" basis where the only actual trade was of blank CDs and shipping. To reduce the number of CDs involved in the trade, the audio tracks were compressed using the shorten lossless compression format.

The Tangerine Tree project was discontinued on 17 October 2006 by Heiko Heerssen due to legal concerns and personal reasons. Releases now can be easily found on the Internet and most reputable trading sites will post those that have not been converted to official releases.

Live concerts by date

1968–1974 Volume Date VenueNotes Runtime Tangerine Tree 59.1 29 September 1968 Essen, Grugahalle, Germany 0:34:56Tangerine Leaves3619 June 1971Goethe University Frankfurt, Germany0:42:14Tangerine Tree59.226 June 1971Ossiach World Music Festival, AustriaTD: "Oszillator Planet Concert" from Ossiach Live (1971)0:08:04Tangerine Tree5225 November 1972Klangwald Cologne WDR Sendesaal, GermanyTD: Zeit (2011)1:18:02Tangerine Leaves1720 May 1973Les Ponts-de-Cé Open Air Festival, France1:25:07Tangerine Leaves7320 November 1973Alhambra Theatre Saint-Ouen, France1:33:38Tangerine Tree2329 November 1973Berlin, Deutschlandhalle, GermanyTD: Atem (2011)0:40:13Tangerine Tree2r29 October 1974Sheffield City Hall, EnglandTD: Bootleg Box 1: Sheffield 740:43:39Tangerine Leaves5220 November 1974Glasgow, Kelvin Hall, Scotland1:26:07Tangerine Leaves4726 November 1974Bradford, St. George's Hall, England0:47:14Tangerine Tree3013 December 1974Reims Cathedral, FranceReplaces Classic Tree 11:24:09

1975 Australian Tour & London show, with line-up of Froese, Franke, Michael Hoenig Volume Date VenueNotes RuntimeTangerine Tree7713 March 1975Melbourne, Dallas Brooks Hall, Australia1:24:00Tangerine Leaves2025 March 1975Adelaide, Festival Theatre, Australia1:26:34 Tangerine Tree 9 2 April 1975 London, Royal Albert Hall, EnglandTD: Bootleg Box 1: London 1975 2:02:31

1975 France and U.K. Tours  — Ricochet Ricochet is a composite "live" album, produced from hours of audio tape recorded during the French and British tours. The only definitively identified source is "Ricochet, Part Two" from the 23 October 1975 concert at Croydon Fairfield Halls. Volume Date VenueNotes RuntimeTangerine Tree2216 August 1975Orange Theatre Antique, France0:57:14Tangerine Leaves7014 September 1975Fête de l'Humanité, Paris, France1:12:44Tangerine Leaves6723 September 1975Reims Opera, France1:11:02Tangerine Leaves64 October 1975Coventry Cathedral, England1:29:29Tangerine Leaves1516 October 1975Liverpool Cathedral, England1:36:52Tangerine Leaves8117 October 1975Glasgow City Hall, Scotland1:14:10Tangerine Leaves3819 October 1975Manchester, Hardrock, England1:24:02Tangerine Leaves320 October 1975York, Minster Cathedral, England1:19:35Tangerine Tree723 October 1975Croydon, Fairfield Halls, EnglandTD: Bootleg Box 1: Croydon 19751:01:34

1976 European Tours Volume Date VenueNotes RuntimeTangerine Tree13.224 January 1976Saarbrücken, Saarland University, Germany1:00:05Tangerine Leaves6826 January 1976Hippodrome Paris, France1:21:05Tangerine Tree631 January 1976Bilbao, Pabellón de la Casilla, SpainTD: Bootleg Box 1: Bilbao 19761:54:21Tangerine Tree279 February 1976Brussels, Auditorium Paul-Emile Janson, Université libre de Bruxelles, Belgium1:38:59Tangerine Tree5511 February 1976RAI Congress Centrum, Amsterdam, Netherlands1:44:44Tangerine Tree475 June 1976Manchester, Palace Theatre, England1:48:43Tangerine Tree347 June 1976London, Royal Albert Hall, England1:32:24Tangerine Tree8110 June 1976Brighton, The Dome, England1:19:47Tangerine Tree8r27 June 1976Berlin, Philharmonics, GermanyTD: Bootleg Box 1: Electronic Rock at the PhiharmonicsTD: Soundmill Navigator (re-mixed)0:31:15

1976 European Tour — Stratosfear Volume Date VenueNotes RuntimeTangerine Leaves6420 October 1976Hanover, Stadthalle, Germany1:12:34Tangerine Tree4521 October 1976Düsseldorf, Philipshalle, Germany1:32:35Tangerine Leaves4627 October 1976Munich, Cirkus Krone Bau, Germany1:31:57Tangerine Leaves4029 October 1976Mainz, Elzer Hof, Germany1:03:07Tangerine Tree13.131 October 1976Mannheim, Mozart Saal, Germany1:21:30Tangerine Tree1r8 November 1976Nottingham, Albert Hall, EnglandTD: Bootleg Box 2: Nottingham 19761:19:41Tangerine Leaves169 November 1976Portsmouth, Guild Hall, England1:07:09Tangerine Leaves1812 November 1976Birmingham, Odeon, England1:18:30Tangerine Leaves6213 November 1976Leeds, University, England1:19:55Tangerine Leaves2314 November 1976Croydon, Fairfield Halls, England1:17:32Tangerine Tree31r16 November 1976Brussels, Ancienne Belgique, Belgium1:04:11Tangerine Tree1922 November 1976Paris, Palais du Sport, France1:53:40Tangerine Leaves8726 November 1976Barcelona, Nuevo Pabellón Deportivo, Spain1:35:35

1977 North America Tour — Encore Volume Date VenueNotes RuntimeTangerine Leaves2129 March 1977Milwaukee, Riverside Theatre, USA1:11:22Tangerine Tree25r31 March 1977Detroit, Ford Auditorium, USATD: Bootmoon Series: Detroit– March 31st, 19771:39:03Tangerine Leaves911 April 1977Chicago, Aragon Ballroom, USA1:15:44Tangerine Leaves852 April 1977Cleveland, Music Hall, USA1:32:01Tangerine Tree44 April 1977Washington, Lisner Auditorium, USATD: "Monolight" from EncoreBootleg Box 2: Washington 19771:49:12Tangerine Leaves555 April 1977New York, Avery Fisher Hall, USA1:18:07Tangerine Leaves578 April 1977Toronto, Convocation Hall, Canada1:19:55Tangerine Tree189 April 1977Montreal, Place des Arts, CanadaTD: Bootmoon Series: Montreal– April 9th, 19771:54:46Tangerine Leaves3211 April 1977Quebec, Hilton Convention Center, Canada1:19:51Tangerine Tree3921 April 1977Seattle, Paramount Theatre. USA1:08:39Tangerine Tree6626 April 1977Santa Monica, Civic Auditorium, USA1:44:23

1978 European Tour — Cyclone Volume Date VenueNotes RuntimeTangerine Tree6719 February 1978Berlin, Eissporthalle, Germany2:08:21Tangerine Tree1124 February 1978Hamburg, Audimax, GermanyTD: Bootleg Box 2: Hamburg 19780:52:40Tangerine Leaves3025 February 1978Düsseldorf, Philipshalle, Germany1:28:44Tangerine Leaves391 March 1978Nantes, Palais de la Beaujoire, France1:50:44Tangerine Leaves517 March 1978Brussels, Cirque Royale, Belgium1:33:43Tangerine Tree9119 March 1978Oxford, New Theatre, England1:01:36Tangerine Leaves5020 March 1978 London, Hammersmith Odeon, England1:56:31Tangerine (neither Tree nor Leaf!)Never released23 March 1978Newcastle, City Hall, England1:29:29Tangerine Leaves8624 March 1978Glasgow Apollo, Scotland1:47:37Tangerine Leaves6025 March 1978Manchester, City Hall, England1:03:19Tangerine Leaves7526 March 1978Empire Liverpool, England0:20:33Tangerine Tree9228 March 1978London, Hammersmith Odeon, England1:58:29

1980 East Berlin — Pergamon Volume Date VenueNotes RuntimeTangerine Tree17r31 January 1980East Berlin, Palace of the Republic, GermanySecond of two concerts on this dayTD: Quichotte (1980), Pergamon (1986).1:45:14

1980 European Tour — Thief Volume Date VenueNotes RuntimeTangerine Tree2613 October 1980Brussels Cirque Royal, Belgium1:40:51Tangerine Leaves5416 October 1980Hamburg, Congress Centrum, Germany1:46:39Tangerine Leaves4517 October 1980Luxembourg, Centre Culturelle, Luxemburg0:50:05Tangerine Leaves8220 October 1980Bologna, Palasport, Italy1:43:31Tangerine Leaves81 November 1980Dublin, National Stadium, Ireland1:45:28Tangerine Tree625 November 1980Preston, Guild Hall, EnglandTD: Bootmoon Series: Preston– November 5th, 19801:49:11Tangerine Leaves7815 November 1980Royal Court Liverpool, England2:30:33Tangerine Leaves6122 November 1980Santa Monica, Civic Auditorium, USA1:43:17

1981 European Tour Volume Date VenueNotes RuntimeTangerine Leaves721 January 1981Aachen, Eurogress, GermanyTD: Bootmoon Series: Aachen– January 21st, 19811:47:39Tangerine Tree56.126 January 1981Berlin, ICC, Germany1:21:12Tangerine Tree142 February 1981Paris, Bataclan, FranceTD: Bootmoon Series: Paris– February 2nd, 19811:44:30Tangerine Leaves356 February 1981Rome, Palazzetto dello Sport, Italy1:19:16Tangerine Leaves247 February 1981Cantù, Palasport Piarelli, Italy1:27:02Tangerine Tree288 February 1981Florence, Teatro Tenda, Italy1:26:29Tangerine Tree5329 August 1981Berlin, Reichstagsgelaende, Germany1:35:44

1981 British Tour — Exit Volume Date VenueNotes RuntimeTangerine Tree7815 October 1981Oxford, New Theatre, England1:32:06Tangerine Leaves7916 October 1981Portsmouth, Guild Hall, England1:32:47Tangerine Leaves1417 October 1981Brighton, Dome, England1:32:28Tangerine Tree8920 October 1981London, Hammersmith Odeon, England1:52:24Tangerine Tree10r25 October 1981Newcastle City Hall, EnglandTD: Bootleg Box 2: Newcastle 1981(TT10r replaces only disc 2 of TT10)1:50:27Tangerine Leaves9n26 October 1981Edinburgh, Usher Hall, Scotland1:49:38Tangerine Tree 56.211 November 1981Gelsenkirchen, Germany0:26:01

1982 Australian Tour