Just one dream at a time for me. In the past, there is always a song in parallel with the dream, but the song has a symbolic connection to the meaning of a dream. Occasionally I'll get two different songs going at once, but not usually, and they're not equally in the foreground at the same time.

Previously I had one carefully scripted dream per night, like playing a movie, but those have gone away. I'm usually not 'in' a dream in the sense of having a body in it, so I don't think the 'god mode' distinction quite applies in my case. Off hand I can't think of anything running backwards. Only a few times in my life have I ever dreamed the same thing twice, and each time there was a clear reason for it, in terms of expressing the meaning of the dream.