From the fount of all knowledge - accuracy not guaranteed
The soundtrack of Solaris features Johann Sebastian Bach's chorale prelude for organ Ich ruf' zu dir, Herr Jesu Christ, BWV 639, played by Leonid Roizman [ru], and an electronic score by Eduard Artemyev. The prelude is the central musical theme. Tarkovsky initially wanted the film to be devoid of music and asked Artemyev to orchestrate ambient sounds as the score; the latter proposed subtly introducing orchestral music. The classical music used for Earth's theme stands in counterpoint to the fluid electronic music used as the theme for the planet Solaris. The character Hari has her own subtheme, a cantus firmus based on Bach's music featuring Artemyev's music atop it; it is heard at Hari's death and at the story's end.
Logically speaking works aren't connected by something or someone other than the works themselves. I think Romy will have to clear up this mini mystery.
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