Spellbound (Alfred Hitchcock, USA; 1945)

I watched Spellbound years ago in a cinema. I've watched it again this week on dvd. What struck me was that the dvd version begins with an Overture and ends with Exit Music. What you see is a picture of a tree in autumn and the words Overture/Exit Music, respectively, in the same font as the credits. What you hear is the film music of Spellbound. The odd thing is that these two items take ages before you see the credits. I got the idea there was something wrong with the dvd. I'm just wondering whether Hitch himself added the music or somebody else thought this a good idea. I saw the cinema version about sixty years ago and I can't for the life of me remember anything about this musical preface and postscript. When I saw the film again this week I found that it is still pretty good, better than, say, Suspicion (Hitchcock, 1940).