Over the years I've noticed an odd trend that the vast majority of the music in my dreams comes from the 50s and early 60s. So much so, that this era of music has become a standard dreamsign of mine.
This is not an era that I hold any particular special interest in, nor did I live through them.
However, there is something about the slight spooky reverb that imbues the music of that era that seems to fit the dreamscape very well. Have you noticed any particular theme or era for the music in your own dreams? As an example, last night I woke from a dream with this tune playing: (oddly enough the dream had something of a sci-fi theme)
Another classic that has appeared playing in the background of many of my dreams is perfectly appropriate, Mr. Sandman, so much so that it has become one of my dreamsigns.