I was fortunate to receive the following insight from Hiphats

The music for DUNE was composed by the Grammy-Winning rock group Toto ("Rosana", "Hold The Line") and Brian Eno (producer and co-founder of the British group U2), but don't think for a second that this is a rock score. It truly is a majestic, if not dark in tone, score brought to life by Marty Paich (whose son, David Paich, is the founding member of Toto) and the Vienna Symphony Orchestra. The soundtrack album was released at the same time as the film on Polydor Records, CDs and Cassettes, then went out of print and recently re-issued on CD on an independent label. The album actually contains some alternate versions of cues and some music that can be found only in the Allen Smithee and "Channel 2" versions of the film.  Here is the DUNE soundtrack, track-by-track: SIDE ONE

1. PROLOGUE (1:47) Presented as it is in the theatrical version of the film and spoken by Virginia Madsen (Princess Irulan). 

2. MAIN TITLE (1:15) The orchestration and instrumentals in this alternate version are different from the "stronger" interpretation used in the movie. 

3. ROBOT FIGHT (1:18) This entirely synthesized track underscores Paul's training with a robot fighter. This is the only track on the LP not written or co-written by David Paich. 

4. LETO'S THEME (1:43) In the theatrical version, this slight variation on the main theme underscored Leto's discussion with Paul about leaving Arrakis. In the two extended versions, an alternate cue was tracked in. 

5. THE BOX (2:37) This track is actually the first portion of the cue where Paul is tested with a box for his manhood. On this album, the music ends just as Paul puts his hand in the box. 

6. THE FLOATING FAT MAN (THE BARON) (1:24) This starts off with Baron Harkonnen's dialogue ("The Duke will die before these eyes..."), then goes into the music for the "Heart Sucking Scene" where the Baron unplugs a young girl's heart and he smothers himself with blood. 

7. TRIP TO ARRAKIS (2:35) This is actually the second half of the cue where Duke Leto and his family "travel without moving" to Arrakis. In the extended versions, most of this cue was altered with music from later in the film. 

8. FIRST ATTACK (2:43) Music underscoring the sequence where the Harkonnens first attack Arrakis. In all versions of the film, this cue was shortened. 

9. PROPHECY THEME (4:19) Typical Brian Eno music laden with synthesizers. This theme is first heard in the movie to underscore the head Reverend Mother's reading of the Prophecy ("One will come, the voice from the outer waters...") Strange as it may seem, NONE of this theme is heard in the extended versions. 

SIDE TWO

1. DUNE (DESERT THEME) (5:30) This interpretation of the "Desert Theme" is not heard in the film as it sounds like typical Toto music, no orchestra to back them up, but the guitars are a wow! 

2. PAUL MEETS CHANI (3:04) Underscores the scene where Paul comes face-to-face with the woman he has been seeing in his "waking dreams". 

3. PRELUDE (TAKE MY HAND) ( :59) This short orchestration of the end title theme was originally recorded as the film's overture, but not heard in the theatrical prints. But it was included in the extended versions in the scene where Jessica takes the poisonous "water of life". 

4. PAUL TAKES THE WATER OF LIFE (2:48) This is the music originally intended for the title scene but not used in the theatrical print (the "Prophecy Theme" was used instead). However, fragments of this were restored in the extended versions.

5. BIG BATTLE (3:06) Accompanies the final battle between the Harkonnens and the Fremen. This was shortened somewhat in the theatrical print, but heard in its full version in the extended prints. 

6. PAUL KILLS FEYD (1:51) This cue was the music originally recorded for the sequence where Paul battles Feyd-Rautha to the death. In the theatrical version, an alternate cue was used, but this original recording was used in the extended versions. 

7. FINAL DREAM (1:25) Another original version of a cue that was replaced with music from elsewhere in the film. This was meant to underscore Paul being transformed into the Kwisatz Haderach.

8. TAKE MY HAND (2:35) The end title mix used on this LP is different than the one in the film, where in that version Toto is backed up by the Vienna Symphony Orchestra. In this version, however, there are no strings to help David Paich and his band of men.

There you have it. The information for the DUNE Soundtrack, should you wish to create a link on your DUNE web page.