What's the name of the ending theme of 'American Family - 2nd season'?

I watched "American Family - Journey of Dreams" a long time, and all I can think about in that show is the theme on the credits, and in few episodes of the second season, on the intro (Sorry, I haven't seen the first season). I can't explain it, but it's so beautiful and sad. I don't the name of the theme and I don't know if it even exists outside of the show. Can you help me out?

UPDATE:

Nevermind, I found the name of the symphony. It's the fourth part of "Symphony no. 5" by Gustav Mahlar: the "Adagietto". The symphony depresses me so...and yet when I found it and listened to it, I wasn't as tear-eyed as before. I must've got use to it.