Opéra Sauvage is a soundtrack album by the Greek electronic composer Vangelis, released in 1979.

[1] The album is full of classical-based and warm melodies, orchestrated with Yamaha CS-80 sounds.

[6] "Hymne", "L'Enfant", "Mouettes" and "Irlande" build on fairly simple themes that are developed instrumentally.

"Rêve" is, indeed, as the title suggests, a dreamy calm piece with the hint of jazz in the climax.

[1] In the Allmusic review it is described as "rich, electronic orchestrations range from grandly symphonic to simple and serene" and as an "excellent introduction to his music".