According to director J.J. Abrams, the End Credits music from Star Wars: The Force Awakens runs for nearly 8 minutes and includes Rey’s Theme, the Resistance theme and Kylo Ren’s theme. Abrams also mentioned that Leia’s theme and the Force theme are heard in the score.
“Interviewer: Talk about the importance of the music in this film.
J.J. Abrams: “When I think of the things that George Lucas did and got right, and got perfectly in that first movie, it is so long and stunning to think of those things, but nothing on that list is more important than the music. That’s not to say there aren’t things that aren’t as important, but they aren’t more important. And what John Williams did, his gift to Star Wars and to fans, it is that you can’t oversell the importance of what he does. And to know that he was coming back to create a score for The Force Awakens was as exciting as any other aspect of working on this movie, for the very first discussion I had with Kathy Kennedy.
To be on the stage when John Williams conducted the Main Titles, which of course is familiar to everyone… that was incredible. But then, to watch him conduct and hear the orchestra play so beautifully the End Titles, the almost 8-minute long End Titles, was incredible. It starts the way it always starts, but then it goes into these themes, Rey’s Theme, the Resistance Theme, Kylo Ren’s Theme… these incredible tunes that we’d become accustomed to over the months of doing post-production… That was so beautiful, and soaring, and emotional, and powerful… and somehow perfectly integrated with the score and the music that we know: the Force Theme, Leia’s Theme… He just, like no one else, is able to take what we know and do something brand new, and somehow allow them to coexist. And I realized that’s what we’re trying to do all along.“
You can listen to his segment at 13:36 into the video: