The main title music and instrumental score of the series as a whole were composed by [[Michel Legrand]], his first work for the ''Once Upon a Time...'' series.
The main title music and instrumental score of the series as a whole were composed by [[Michel Legrand]], his first work for the ''Once Upon a Time...'' series. The score made sure use of blending Legrand's signature jazz-funk with synthesized electronic music. The series' eponymous theme song was performed in the original French-language version by [[Jean-Pierre Savelli]]. An alternate version was recorded for the compilation feature film ''Revenge of the Humanoids'', and was performed by [[Virginia Vee]].<ref>{{cite web|url=https://www.discogs.com/release/5751525-Michel-Legrand-La-Revanche-Des-Humanoïdes|title=Michel Legrand – La Revanche Des Humanoïdes|website=Discogs|date=1982 |access-date=5 July 2025}}</ref> The song was released as a single in 1982 by [[RCA Records]] (PB 61015),<ref>{{cite web|url=https://www.discogs.com/release/2203585-Michel-Legrand-Il-Etait-Une-Fois-LEspace-Bande-Originale-De-La-Serie-Televisee|title=Michel Legrand – Il Etait Une Fois... L'Espace (Bande Originale De La Serie Televisee)|website=Discogs|date=1982 |access-date=5 July 2025}}</ref> along with a condensed audio adaptation of the episode "Du Cote d’Andromède" (PL 37720).<ref>{{cite web|url=https://www.discogs.com/release/3544595-Michel-Legrand-Il-Était-Une-Fois-Lespace-Du-Cote-DAndromède-|title=Michel Legrand – Il Était Une Fois... L'espace (Du Cote D’Andromède)|website=Discogs|date=1982 |access-date=5 July 2025}}</ref> A second single of the song was issued in 1983 with another Savelli song "Humanoïdes" (PB 61074);<ref>{{cite web|url=https://www.discogs.com/release/6450699-Jean-Pierre-Savelli-Il-Etait-Une-Fois-Lespace-Humanoïdes|title=Jean-Pierre Savelli – Il Etait Une Fois... L'espace / Humanoïdes|website=Discogs|date=1983 |access-date=5 July 2025}}</ref> the lyrics were later translated in the English-language dub, retitled as "Fly with Me", this version was also sung by Virginia Vee.
=== Theme music and song ===
Most of the instrumental music from the series would later be reused for later ''Once Upon a Time...'' series, starting with ''Life''.▼
AThe soundtrackseries' albumeponymous collectingtheme allsong was performed in the instrumentaloriginal musicFrench-language version by [[Jean-Pierre Savelli]]. An alternate version was recorded for the compilation feature film ''Revenge of the seriesHumanoids'', and was firstperformed by [[Virginia Vee]].<ref>{{cite web|url=https://www.discogs.com/release/5751525-Michel-Legrand-La-Revanche-Des-Humanoïdes|title=Michel Legrand – La Revanche Des Humanoïdes|website=Discogs|date=1982 |access-date=5 July 2025}}</ref> The song was released as a single in 19991982 by Procidis[[RCA Records]] (56101PB 61015),<ref>{{cite web|url=https://www.discogs.com/release/70685922203585-Michel-Legrand-Il-ÉtaitEtait-Une-Fois-LespaceLEspace-Bande-Originale-De-La-Serie-Televisee|title=Michel Legrand – Il ÉtaitEtait Une Fois... L'espaceEspace (Bande Originale De La Serie Televisee)|website=Discogs|date=19991982 |access-date=5 July 2025}}</ref> andalong laterwith reissueda incondensed 2001audio byadaptation [[:fr:Loga-Rythme|Loga-Rythme]]of (LR-677004)the asepisode a"Du partCote ofd’Andromède" the(PL ''Anime Classique'' range37720).<ref>{{cite web|url=https://www.soundtrackcollectordiscogs.com/title/37284release/3544595-Michel-Legrand-Il+-Était+-Une+-Fois...+L%27Espace-Lespace-Du-Cote-DAndromède-|title=Michel Legrand – Il Était Une Fois... L'Espace-espace Soundtrack(Du detailsCote - SoundtrackCollector.comD’Andromède)|website=Soundtrack Collector.comDiscogs|date=February 4, 20021982 |access-date=5 July 2025}}</ref> A second single of the song was issued in 1983 with another Savelli song "Humanoïdes" (PB 61074);<ref>{{cite web|url=https://www.discogs.com/release/7645116450699-MichelJean-LegrandPierre-Savelli-Il-ÉtaitEtait-Une-Fois-Lespace-Bande-Originale-Du-Dessin-AniméHumanoïdes|title=MichelJean-Pierre LegrandSavelli – Il ÉtaitEtait Une Fois... L'espace (Bande Originale/ Du Dessin Animé)Humanoïdes|website=Discogs|date=20011983 |access-date=5 July 2025}}</ref> the lyrics were later translated in the English-language dub, retitled as "Fly with Me", this version was also sung by Virginia Vee.
=== Score ===
▲MostThe incidental score made sure use of blending Legrand's signature jazz-funk with synthesized electronic music; most of the instrumental music from the series would later be reused for later ''Once Upon a Time...'' series, starting with ''Life''.
A soundtrack album collecting all the incidental music of the series was first released in 1999 by Procidis (56101),<ref>{{cite web|url=https://www.discogs.com/release/7068592-Michel-Legrand-Il-Était-Une-Fois-Lespace|title=Michel Legrand – Il Était Une Fois... L'espace|website=Discogs|date=1999 |access-date=5 July 2025}}</ref> and later reissued in 2001 by [[:fr:Loga-Rythme|Loga-Rythme]] (LR-677004) as a part of the ''Anime Classique'' range.<ref>{{cite web|url=https://www.soundtrackcollector.com/title/37284/Il+Était+Une+Fois...+L%27Espace|title=Il Était Une Fois... L'Espace- Soundtrack details - SoundtrackCollector.com|website=Soundtrack Collector.com|date=February 4, 2002 |access-date=5 July 2025}}</ref><ref>{{cite web|url=https://www.discogs.com/release/764511-Michel-Legrand-Il-Était-Une-Fois-Lespace-Bande-Originale-Du-Dessin-Animé|title=Michel Legrand – Il Était Une Fois... L'espace (Bande Originale Du Dessin Animé)|website=Discogs|date=2001 |access-date=5 July 2025}}</ref>
