I like [Soul Food] Soundtrack but you prefer relaxing music....
Let me see...How about [Phenomenon]
http://www.amazon.com/Phenomenon-Motion-Picture-Various-Artists/dp/B000002NB0
I love this song & Movie!
Not really a film so much as a series. I love the soundtrack to
Cowboy Bebop (Yoko Kanno and the Seatbelts). I think the soundtrack
to Shinseki Ebangerion and Kare Kano are also interesting.
Apart from those, I think maybe Crouching Tiger, Hidden Dragon.
#3
I second that... Yoko Kanno is an excellent composer.
I particularly like the "Stand Alone Complex, Vol 2" and "Solid State Society" CD's.
As for *movie* soundtracks...
I really like the soundtrack to the movie Heavy Metal (1981), but you might not consider all of the songs to be relaxing necessarily.