What makes Étude by Mike Oldfield notable?

'Étude' notably served as the theme for the film 'The Killing Fields', which introduced Oldfield's music to a broader audience. The album's critical reception highlighted its emotional depth, reinforcing Oldfield's reputation for crafting atmospheric soundscapes and contributing to film music. By 1984, Mike Oldfield had already established himself with landmark albums like 'Tubular Bells' (1973) and was exploring new avenues in his sound. 'Étude' followed his previous work, 'Crises' (1983), and showcased his ability to create cinematic music as he transitioned towards more instrumental and thematic compositions.